Halo 5 will see John betray the UNSCThe SPARTAN-IIs, in the end, are not loyal to the UNSC, but to Halsey. The foreshadowing was put in play in Halo 4, with him going against the UNSC when he disagreed with them. Now, he's lost his closest connection, and the UNSC is actively trying to kill Halsey as of the end of season one of Spartan Ops. Perhaps the only person who could find a way to get him Cortana back is Halsey, and she and the UNSC are not exactly friends right now. Seeing as the SPARTAN-IIs see Halsey as their mother, well, who do you think he's going to side with, his bosses, or her? Perhaps Halsey and John (with Halsey as the Voice with an Internet Connection) fighting the Storm Covenant, the UNSC and possibly the Flood, seeing as the UNSC has decided to park themselves on Halo rings, which we know are full of the Flood. Plus, Jen and Steve play off each other too well not to have them still together.
The Composer will come into play...... to bring Cortana back, or even further bring her back as a physical (if not Human, then VERY CLOSE to Human) being. It is heavily implied that the digitization of a living being causes problems during the digitization, meaning that only corrupt data is available for them to be restored back to their original state. However, what happens if you try to Compose a being that is already digitized? An AI like Cortana would sidestep the issue of organic->digital conversion by not even being organic initially, meaning that she can potentially Compose herself as a bio(logical/mechanical) being, and since even then she's still data can 'die' only to reCompose yet again... making her the perfect team-mate for the next games, potential fuel for funny (constant respawning due to her being new to things, developing a pro/noob dynamic with the Chief/Cortana), heartwarming (touching, and being able to feel), and awesome (Battle Couple with the Chief).
Cortana doesn't really die.Is it just me or is anyone else suss about Cortana's apparent death at the end of the game? I think we'll be seeing her again in the other 2 games via one of the clones acting as a backup and rewriting a new Cortana model.
The Enemy...The antagonists in Halo 4 will be a radical human faction that has exploited Forerunner technology and crafted unique armor, weapons, grenades, vehicles, ships et cetera...their goal is to conquer and annex the entire galaxy and rule it just as the forerunners did, which will bring them into direct confrontation with the UNSC and by extension, the Master Chief. They'd call themselves the "Sons of the Forerunners" or something along those lines. They would present a new, fresh enemy in that your task would now be to kill rival human soldiers, but at the same time they are "alien" and menacing enough to be a major threat.
LocationsThe new trilogy will probably explore the Greater Ark (the larger sibling to Installation 00) and Halo Installation 07 (which was used as the preserve dedicated for humans, but was overun by the Flood and is now a repository and memorial for constructs made of preserved human personalities)
Spartan Ops guesses.My guess is it will start out with pirates and move on to bigger threats.
There will be a secret weapon that you can unlock after beating the campaign on legendary.
Why the Elites are your enemies againControversial though Halo: Glasslands may be, it introduces some serious conflict between the "mainstream" Elites led by The Arbiter and advocating peace with the humans, and the "Servants of Abiding Truth", religious fanatics who still blindly worship the Forerunners and want to resume war with humanity. Perhaps, in the years between Halo 3 and Halo 4, the two sides came to blows in a Sangheili Civil War... and the Arbiter's side lost. Now, with the human-friendly Sangheili higher-up and his supporters dead, the Servants of Abiding Truth have full control over the species again and have re-declared war against humanity.
There will be more Marathon references
Forward Unto Dawn couldn't have been damaged from the Ark's destabilization
The plot will be even more confusing than that of Marathon
You know what, the reason your fighting the Covenant is becauseThey were cut off from the rest and didn't get the message for a long time. So of course they will fight you in the campaign, they didn't know that Truth betrayed the Sangheili and Thel finding out the truth of Halo etc, etc.
For the whole Reclaimer TrilogyWhile in the final Marathon game there was parallel universe travel, at some point in the Reclaimer trilogy there will be time travel. Chief will be the one to activate Alpha Halo and possibly the entire Array personally - this being based off Guilty Spark's lines waay back in the original Halo. After all, he could tell the difference between Reclaimers (as per Halo:The Flood, with the Marine in the library) but he still expressed confusion over why Chief specifically was hesitant - saying "you were with me every step of the way [last time]".
Cortana will "die" at some point in the new trilogy.Because let's face it, the odds are not looking good for her so far.
Nicole 458 Will be made Canon to the Halo Universe.I just think it would be cool. Perhaps through cloning. Perfecting the technology so that rather than replacing a real child with a temporary clone that eventually dies, they instead make a long lasting clones and use a process to accelerate the process while undergoing the original Spartan II training regiment and enhancements. Bada bing Bada Boom: 458. Naturally. Mounty Oum will need to be hired so that her appearance can be canon as well.
The Prometheans are Forerunners that were transformed/melted into the Prometheans. .Think about it, if the forerunners populating the shield world arn't there, then a logical explanation would be that the diadect(who I presume to be the big bad.) attacked or betrayed them and made them into his own army of cyborgs so he could kill humanity as revenge for being a part of the reason his wife's death. This also explains the scary skull in the promethean knights head/helmet. 8 Actually the Prometheans are already a group in the Forerunner warrior-servent caste. Plus I doubt the big bad is the Didact, at least the original we know, but it is possible it could be this Ur-Didact people speak of, though for all we know it could be the Master Builder but everything is up in the air at this point.
Cortana is responsible for everything.Because she wanted an excuse to wake up Chief. As she slipped into rampancy, she remembered the good old days, when they dismantled the Covenant together. Her sense of reason and morality falling apart, she puts the pieces in play for an epic conflict while Master Chief is asleep, so she can fight alongside the Chief one last time before Rampancy destroys any last vestiges of her identity. Hence the fact that the Covenant are coincidentally right there when the Chief wakes up (playing on his nostalgia for Covenant-killin'), and the fact that a ship full of Spartans just so happens to be cruising by the Legendary Planet (to play off of Chief's desire to protect his fellow soldiers). All in all, it will be the perfect plan...until Chief inevitably realizes that he's been betrayed by his best friend, probably after he's already cut a bloody swath through all of the bad guys and saved the day.
Master Chief will die at some point in this new trilogy.How else to show how fucking serious things are then to kill the main character and have a new protagonist.
Dr. Halsey, who is confirmed to be in Halo 4◊, will die in said gameJust making a prediction. How, why, and at the hands of whom remains to be seen, but it may be done to give the Master Chief another reason to want to kill the game's Big Bad.
The Ancient Humans destroyed the Flood Cure when the Forerunners went to warBecause they saw the Forerunners as Ungrateful Bastards since they were doing them a favor by destroying Flood infected Forerunner worlds. "You want to fight the Flood? Fine. You do it the way we did. Through years of blood, sweat, and pain."
The Flood will returnIf the Flood is of interstellar origin, what's to say there hasn't been some more samples floating in from the interstellar void and infecting a planet or two on the edge of the Galaxy.
Cortana achieved Metastability in her final momentsJust a nice thought, and it makes her immediately-following death even more bittersweet.
The Composer worked during the Flood-Forerunner war, but the personalities of those it turned into Prometheans had more control than expectedEach of the humans that were Composed soon realized what happened to them. While they could not directly get revenge on the Forerunners, they could under-perform just enough as Prometheans that they would be destroyed. Hell, they may have played a role in Mendicant Bias being contacted and later turned by the Gravemind.
We haven't seen the last of Cortana.Somehow, some way, we'll see her again. And since Forerunner "ancillas" seem to last centuries without going rampant, maybe she'll be able to survive in the same way Chief survived the Composer: with help from some Forerunner tech.
Halo 6 will feature multiple endings like mass effect 3.However, knowing how the fanbase reacted to it, they will take some lessons from that. While there might be some amount of a Gainax Ending (possibly as a Marathon Infinity reference) they will be more emotionally satisfying.
The Red vs. Blue Easter Eggs represent a timeline in which the Blood Gulch crew were all recruited into the SPARTAN-IV programI mean, they've become surprisingly badass in the later seasons, after all.
Crimson will die, and be replaced as player characters by Shadow Team. Episode 5 ends with Crimson hugely outnumbered. While some sort of last-minute rescue would make sense, them all dying would be interesting. At the very least, it would create tension aboard the Infinity, with Roland and Miller having sent them off on a series of missions that ended with them getting killed while Palmer was away. Meanwhile, Episode 5 also introduced us to Shadow Team, a group of Spartans badass enough to board and destroy a Covenant capital ship. I'm guessing the fact Crimson ends up in what looks to be a no-win situation and their introduction takes place in the same episode isn't a coincidence.
Either Dalton or Miller will die.To serve as a Player Punch. Probably Miller due to the fact that he has more of a character than Dalton.
Parisa from Paradise Hotel will play a major role in a future game.
Crimson will be on the run from the Covenant and cut off from Infinityat the start of Episode 6.
Halo 5 will be the last game in the series in which the Covenant are enemies.
The final, pre-Halo 5 Spartan Ops mission...
Brutes will make a surprise appearance.
GEN2 armor has a slot that completely hides the Spartan's combat knife.Not only does it explain why it doesn't appear anywhere on the armor, it also explains why Crimson's knives weren't confiscated along with the rest of their weapons when they were captured.
Halsey is helping 'Mdama unseal the Librarian...Because she, unlike 'Mdama, knows that the Librarian is, unlike the Didact, on humanity's side, and when she gets out she won't be happy at all upon finding out what 'Mdama and his people have been doing to the humans.
Roland, the Ship's AI very well may be going Rampant
Gabriel Thorne will be a major character in Halo 5
The final RvB easter egg of Season 1......will be the Chupathingy music, which plays when you get into a Warthog. Search your feelings, you know you want it to be true.
In the future, Master Chief will be forced to kill HalseyAt the end of Spartan Ops, Season 1, Halsey betrays the UNSC and sides with Jul 'Mdama. Chief finds out about the events that happened over the course of the season, including the kill order on Halsey. At first, he believes that Halsey is innocent, but is then showed evidence of her collaboration with 'Mdama as well as her hijacking of Roland, thus prompting the Prometheans to invade the Infinity, killing who knows how many crew members. Chief then concedes that she deserves punishment, but insists on coming along, hoping that he can talk her into surrendering peacefully. When he catches up to her, she gives a Motive Rant, and he realizes that there's only one option left.
Halo 4 was a fanfiction written by one of the characters in Puella Magi Madoka Magica or Halo 4 was based off/ or IS 343's response to Madoka1: Master Chief and Cortana's characterization NEARLY paralells with Madoka and Homura's. 2: It involved Jerkass aliens. 3: Sayaka and Del Rio both stubbornly fail to heed vital advice from Homura/the Chief, with disastrous results. 4: The ending is the same. 5: witches are magic girls/promethians are humans, contract=enlistment into the UNSC army, with the only way out is death 6: The setting is a place that LOOKS nice, but in actuality, is a Crapsack world filled with evil creatures.
The Big Good from Halo 5 onward will be the IsoDidact.The Silentium epilogue appears to have confirmed his survival, and he seems to be benevolent towards humanity. It'll be interesting to see him assist humanity and eventually go toe-to-toe with his original self.
Characters who are potential SPARTAN-IVs, on account of their competency and possible survival of the Human-Covenant War:
Halo 5 or Halo 6 will see ONI become an antagonist
Cryogenic freezing ages you faster.Not while you're frozen per se, but the constant freezing and thawing stresses your body, producing much more wear and tear than there should be. There is some evidence for this since Lasky is allergic to the process. Maybe it hurts everybody to some degree, it's just people like Lasky are affected more by it. Notice quite a few people who look worn beyond their years in Halo-verse. Dr. Tillson was stated to be 51, but she looks like she's pushing 70. And IIRC, Master Cheif is only supposed to be 40-something, but in the legendary ending, his hair is greying, and he has a lot of wrinkles, he looks almost 60.
The Spartans of Fireteam Crimson are Spartan-IIIs.It's mentioned in the backstory that surviving S-IIIs were offered the chance to be moved into the S-IV Corps. It would certainly help explain Crimson's professionalism and competency compared to the other IVs.
Cortana will return in Halo 5....As a Villain.By now, Cortana's return has definitely a popular WMG amongst the Halo fandom, and there have been plenty of theories as to how exactly 343 will make it happen. Heck, bringing back Cortana is implied to be (at least one of) the Chief's primary goal in the Halo 5 teaser. No matter how you look at it, it seems pretty likely that we haven't seen the last of everyone's favorite AI. But who said she'll still be the same AI we know and love? She could come back evil for a few reasons. 1. Bungie already used the 'Rescue Cortana' story arc for Halo 3. If Halo 5 becomes a quest to bring her back exactly as she was, it would just be a rehashing, and I don't think 343 wants to go down that road. 2. Also, if they were going to resurrect Cortana just the way she was, then what was the point of killing her off in the first place? From a narrative standpoint, her death had to serve some kind of purpose. It may have been to force the Chief to develop, and if this WMG turns out to be true, it was also to set up a possible villain. 3. Cortana was rampant right before dying. Yes, her last scene seemed to subtly imply that she had become metastable, but we don't know that for sure. 4. This one ties into her rampancy. Parts of her were in the Composer when she died and it was destroyed, right? Well, what kind of effect do you think a digital horror factory like the Composer can have on an AI's already-delicate-from-Rampancy mind? Rampancy + Composer = Megalomaniacal AI. 5. It would make a great twist, plain and simple. The Chief goes on his quest to bring back Cortana, and half-way through the game, he succeeds. Oh, and just for extra flavor, 343 will take the romantic subtext in Chief and Cortana's relationship and ramp up the creepiness by making Cortana totally Yandere for John. She may attempt to kill several female characters out of sheer jealousy and is determined to make John hers. And for the final touch, she'd even come back with her own body; a twisted form based on Promethean aesthetics, that still kinda sexy in a weird way.