The triangular ships hinted at are Jovian
The player won't actually fight the Darkness directlyIf a fight with the Darkness makes it into the story line then the Traveler will fight the Darkness directly with the player either fighting an avatar or fighting a key battle against an underling who has the means to skew the result of this conflict. After all, the darkness displayed in the intro seems like a giant solar system sized cloud of black goo. A later encounter lends credence to this portrayal of black goo. Its not like the player could just run around shooting at the sky or expect their gun to hurt an entity bigger than the Sun. The encounter on the Moon and later may lend credence to this theory. Matti23
The stars will go outWhen a fight with the Darkness arrives the stars will seem to go out. The Darkness is a huge cloud of black goo so if it heads for Earth it may definitely have this effect on the sky. Matti23
The Darkness isn't a single entity but a group of Godlike beingsOn the moon mission the Hive are said to be waiting for their Gods to return. Crota is said to have taken the moon. There's no mention of a wave of invaders coming after or before the darkness.
Humanity will turn out to have been the villainThe fall may have been caused by humanity having done something terrible, causing the other races to attack.
The Traveler may be the final bossIf the story ever gets wrapped up it may turn out that the Traveler only saved humanity to further its own nefarious goals or that humanity is one of the villains of the game, the Traveler being either a powerful human construct or an ally. Matti23
There are people living inside the TravelerPeople or aliens may operate the Traveler like a spaceship or habitat rather than the Traveler itself being a single entity (Thats no moon... It's a space station.) This leads into...
The Traveler's residents will appear as a faction in the future
The Traveler is related to Cocoon in Final Fantasy XIIICould be another similar construct located on a distant world (with more friendly Fal'Cie responsible for the Traveler's powers).
The Traveler is responsible for humanityís fall from graceThis could be one of three ways:
The Traveler is Durandal after the closing of the universeHe escaped to a parallel timeline, and decided he would protect humanity.
The Security Officer from Marathon will appearWhat was the name Durandal gave him, as the universe closed? Destiny
Destiny is set in the aftermath of the Human-Forerunner warThe Traveler could be a Forerunner Warrior-Servant who has taken a liking to humanity - doesn't that sphere look an awful lot like a Cryptum?
A major questline will be to track down and neutralize someone trying to enter the Traveler and deactivate it.Because that big of object, floating that low above the ground? If it shuts off, it is going to fall unless the Guardians stop it from doing so. It's practically inevitable that someone will try. Of course, that paves the way for major secrets to be revealed about the Traveler, not least of which is locating a suitable door.
The Traveler is sentient, and will be helping you throughout your travels.The E3 demo revealed an AI ally, named Ghost (voiced by Peter Dinklage) who tries to help you. ("Tries" in that during the demo he turns on the lights, which alerts all the baddies). WMGs have been built on less.
The Traveler came from the SunThis poem from Alpha Lupi, an ARG website launched by bungie, associates the sun with hope and returning strength, the same themes associated with the Traveler: The Blaze sits inside a nest of little worlds, still too distant to share its heat but plainly staring out at you. A face emerges, drawn from plasmas and radiation... There must be meanings in its roar. You listen hard and carefully, and sometimes a lucid melody seems to rise out of random noise, pulling your mind into moments where it seems possible that answers are about o be revealed. Joy builds, and the first hope in ages transforms you. It seems important, even critical, to tell every star from here to the black between the galaxies that you are strong again.
There will be an AI called JoyeuseIn The Song of Roland, the inscription on the blade of the sword Cortana read; "My name is Cortana, of the same steel and temper as Joyeuse and Durendal". Bungie's last two sci-fi game series had a Durandal and a Cortana respectively, so they're probably going to complete the set sooner or later and it may as well be in Destiny.
The Location of JoyeuseIn regards to the WMG above about the existence of Joyeuse. Bungie has released information about the location of Charlemagne's Vault on Mars. In the Destiny universe, Charlemagne was (maybe even still is) a warmind, an advanced AI. Joyeuse may in fact be a subroutine or fragment of Charlemagne that is retrieved from Charlemagne's vault.
The Guardians were raised from the deadIt is heavily implied through the Grimoire◊ cards◊ and gear descriptions◊ that the Guardians are in fact long dead beings that were resurrected by the Traveler's Ghost drones. And then there's this piece of NPC dialogue from the Tower
The Guardians are EinherjarAs mentioned before, the Guardians were soldiers during the Golden Age of Humanity, presumably killed in the Collapse when "The Darkness" closed in on the Traveller, and just as presumably Humanity's best during the fall of humanity's empire, thus prime candidates for Valhalla (Or in this case, The Tower). Had Ghost been given a female voice as opposed to male, there would be a very obvious allusion to a Valkyrie here (But alas). One of the major plot-points brought up early on by The Speaker is the coming return of the Darkness, which The Speaker says they will not survive unless something is done - What event could this logically be, being their prophesied final battle? Look no further than Ragnarok.
The Traveler is actually the missing moon of Lh'owonAfter humans and S'pft'kr allied at the end of Marathon 2, the other, more advanced races hinted at decided to attack humanity in order to screw over the S'phft'kr. The S'pht'kr and their flying moon base were able to prevent the total destruction of humanity but not before humans were on the brink of extinction, leaving them no choice but to leave the it there to protect humanity until they could rebuild.
Later content will involve the new expansion of humanity and their allies, as well as introducing new (possibly playable) allies and threats
The Vex, with all of their interdimensional warping, will make a grievous mistake that will prove their undoing.
[[spoiler: The game is a standalone universe separate from previous bungie titles like Marathon and Halo.
The Traveler isn't entirely benevolent and it's previous acts of benevolence are all a part of a larger gambit
Humanity isn't the only race the Traveler's taken an interest in.All of the enemies are linked to the Darkness somehow: the Hive and the Vex worship it and the Cabal are implied to be running from it. The only one without a clear connection are the Fallen. Now, the Fallen used to have a powerful and advanced empire, but then they fell, splitting into multiple disparate noble houses, a shadow of their former glory. Sound familiar? They mirror the human Golden Age, the Collapse, and the Dark Age ("a thousand kings rose and fell then"), only without the Traveler hanging around to start the City Age. It's stated that the Darkness hunts the Traveler wherever it goes. Maybe the Traveler uplifted the Fallen the same way it did to humanity, only when the Darkness came around and toppled their civilization, the Traveler didn't sacrifice itself for them. Instead it fled the Darkness, and much later it encountered humanity and the process repeated. The difference is, for whatever reason, the Traveler decided to rescue the last remnants of human civilization, whereas it simply abandoned the Fallen to their fates. For that matter, maybe the Cabal were uplifted too, but the size of their empire meant that when the Darkness came around and apparently razed their homeworld it didn't affect them nearly as badly.
The Exo Stranger works for the Nine
The Traveler will be revealed to actually be a planetoid sized Ghost
Rasputin will take the Travellers Place
Rasputin is the Vex
The Guardian you control isn't a random long dead person...
The Exo Stranger is from the future
The Exo Stranger is from the distant past
The Traveler is Madoka Kaname's Soul Gem
The Sword of Crota wasn't destroyedThe sword was instead rigged to return to Crota's side and wake him up if the Hive's enemies ever grew strong enough to vanquish the Princes. Nice job breaking it, Hero!
The Vex are fighting the Guardians via Time Travel.Everytime you redo a stage at a higher difficulty, via the daily, weekly, or Nightfall mode; that's the Vex doing it over again. They win any reality you lose.
The Gardener was not the TravellerRasputin mentions that the Gardener was defeated by IT. IT was not the Darkness. IT was the Traveller. The Gardener was the architect of the Black Garden, and the Vex (although much simpler than the current versions) were her creation. However she did not 'shrug' and allow the Vex to be destroyed when she was defeated. She managed to badly damage the Traveller by cracking it's outer layer and taking some sort of organ (The Heart) from it, and placed it in the Black Garden to be protected by her servants. Unfortunately, the Traveller was still able to defeat her, and used the last of it's power to move to Earth. The Vex began to evolve without the Gardener to guide them, and were corrupted by the Heart. They are unable to give the Heart back to the Traveller because they still have the last order from the Gardener hardwired into them, they cannot release the Heart from the Garden. But they worship it, and it wants to return to the Traveller. They are kind of stuck in the logic problem. When you destroy the Heart's guards, it allows the Traveller to reabsorb the mising piece.
Destiny takes place in the same universe as The Bartimaeus Trilogy.The Traveler and Darkness are both massively powerful spirits that are many ranks above even Ramuthra, the huge spirit that was summoned in the first book. The magicians who summoned them? The Hive too over the moon and turned it into a pentacle in order to summon the Darkness while The Speaker did the same for the Traveler over a hundred years ago when it first popped up. Ghosts are mid-ranked Imps or Foliots also summoned by The Speaker and charged with bringing back people who died during the Collapse as Guardians.