This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Neptunia Re;Birth 1 will be in an 8-bit/16-bit format
The new teaser site for the PS Vita game has been released (http://www.compileheart.com/neptune/re-birth1/) and it showcases a pixelated Neptunia with an 8-bit/16-bit looking title for the game series. Is it possible to produce an 8-bit/16-biy game on the VITA?
Jossed, totally and completely, the new teaser shows it to be otherwise, and screenshots show it as a remake using V-level graphics
Think about it. Planeptune, despite being headed by the laziest Goddess short of Plutia herself, Planeptune is the most advanced nation, and despite Neptune's lackadaisical attitude, it has remained the most technologically advanced nation. So the theory is that Neptune's lazy attitude is really just a front; a façade that she puts on for her sister, Histoire, and the other CPUs. In reality, Neptune is actually completely dependable, and hard-working, much like Noire herself. However, Neptune, who knows from Noire's example that the dependable type can be run into the ground easily, puts on the façade of idiocy and hyperactivity to keep people from relying on her too much, and winding up just like Lonely Heart. She puts on a personality type that's easy for someone to make friends with, easy for you to trust, because Neptune wants her own country to be able to rely on her, but not too much. This would explain why Planeptune has been able to survive so long, Neptune in fact does do her own hard work that she doesn't show to Histy and the others, otherwise, even with Histy there, if Neptune was a lazy Goddess, Planeptune would still crumble. Another thing, HDD doesn't alter a Goddesses personality so much as enhance one part of it. In Noire's case, it enhances her ego, in Blanc's case, it enhances her anger, Vert becomes more confident (while in Victory, it increases her arrogance). In Neptune's case, Purple Heart is vastly different from Neptune to the point that she is an entirely different person, determined, reliable, able to carry out tasks with ease. This would mean that Neptune is, in reality, dependable and actually reliable girl that Purple Heart only enhances to where she doesn't hide it.
Hyper Goddess Faith Noire: Super God Black Heart will be set in yet another alternate universe
Due to Neptunia's seeming inability to stay set in a single universe. Look at Producing Perfection, which didn't need to be set in it's own universe (where Plutia for some reason doesn't exist, despite her popularity), it could have just been set in the Ultradimension from Victory, even serving as a sequel that took place after Victory. Instead, nope, alternate universe again. So, looking at Super God Black Heart, where all characters are super deformed and whatnot, it may be yet another game which takes place in a universe similar to but not exactly the same as, the Ultradimension. Neptunia may be trying to beat out Marvel and DC for the most alternate universes.
The next Neptunia game for a console will be for PS 4
Recently (well, as of this post) a Neptunia game was revealed at the end of Tokyo Game Show 2013 for Dengeki. Also around this time, Compile Heart has begun remaking the first two Neptunia games. To remake the first one is understandable, the game was difficult and clunky to play, suffered from inferior graphics to the later two installments (and V later surpassed both of it's 'sister' games visually), and thus, a remake to improve the gameplay and enhance the storyline would make sense. However, Mk2 was revealed to also be getting a remake, when, while a remake is welcome, it isn't necessary. The game is only two years old, and, compared to it's predecessor when holding it up next to V, the graphics haven't aged terribly. The fighting system was vastly improved, so was the gameplay in general. In short, the game is still a viable way to kill some time. So, the theory stands thus; Compile Heart is remaking all three Neptunia games onto the PS Vita so when they release the next Neptunia game for a console, they can release it on PS 4 and, having the portable remakes, people will be much more willing to jumping the generational ship, so to speak. That's the theory anyway.
New status ailments: Anger, Charmed, and Confused.
Hyperdimension Neptunia V II's primary antagonist will be a Neptune.
Croire bails out in Victory's True End, only to be caught by a Neptune, assumed to be the Ultra Dimension's Neptune as a Brick Joke in regards to, and apparently disproving, Neptune being Too Stupid To Live without having immortality. No evidence as to where Croire really went is given though. However, being capable of moving between dimensions would mean mundane capture is kind of pointless to her.
The site for V II currently has only two noticeable details: "Mega Dimension" and Planeptune in ruins.
Recent scans show an older Neptune, something that should be impossible if it were the same Neptune from Victory, Dual Wielding and dressed in a darker version of Neptune's original hoodie.
Putting it all together, Croire got her hands on the Mega Dimension Neptune and is pushing her in the same direction that she pushed Rei originally.
Hyperdimension Neptunia V II's storyline much darker than mk2/Re;Birth 2, if not all of the rest of Neptunia franchise.
We know that mk2 has dark moments due Conquest Ending, but still there's a lot of lighthearted moment. Neptunia V II has these premise: "a goddess who fell into the dark side", "the modification of Gamindustri", and "the biggest threat in the series will arrive". Judging by these premises, this game will have much more serious tone than the rest of series. Even there's a comedic moments and tons of references and parodies as well, this game rejects random silliness and more focusing the serious atmosphere of story itself.
One of the universes in Hyperdimension Neptunia V II will be based on the Conquest Ending
You know how the existence of a multiverse can potentially canonize Multiple Endings? One of the Dimensions in the game one where Gameindustri is in ruins and it (or the corresponding story) is called "Zerodimension Neptunia Z - The Ragnarok of the Goddesses in critical moment" Lets break the second part of that phrase part:
Ragnarok: The term, like Bifrost. comes from Norse Mythology and it is the Final Battle of the Aesir in which all the gods die. Like the rest of the mythos, it was adapted into The Ring of the Nibelung and given the German name Götterdämmerung (note the Gratuitous German in the attack names, mostly Blanc's). The Conquest ending has Nepgear and Neptune being forced to Kill the Gods (although Most of the Deicides were assisted suicides while two were Heroic Suicide and just bloody murder) to stop Arfoire (who is referred to as the Deity of Sin) resulting in a monotheist system and the twilight of the Gods (all but one being dead)
Critical Moment: By the time the Conquest Ending kicks off, It's the end of Gameindustri as they know it. And they were faced with a very Sadistic Choice; either they pool all their shares into one nation so that its CPUs can stand a chance, potentially destroying the other 3 nations in the process, or they sacrifice their lives to power an Unholy Holy Sword. Neither option was preferable, but there was no other known options at the time and the situation became such that they knew that not everything would be saved. Their choice was putting The Needs of the Many, in this case their nations, over themsleves and led into the Twilight of the CPUs above.
The ruined Gameindustri: When Nepgear and the Makers defeated the Deity of Sin with the aforementioned Unholy Holy Sword her final speech states that their Pyrrhic Victory, although will lead to peace and prosperity for a while, will eventually end with the people revolting against their sole CPU. This very same scenario happened before with Rei and Tari, but that was in another universe so Afoire couldn't have known anything about that (then again she became deified in the narrative itself since at least the beginning of the ending, omniscience regarding multiple dimensions is very likely). The ending itself is an allegory for how a monopoly would cause more problems than solutions. Regardless of how or even if, Arfoire knew of Tari, it has been made clear that a monotheist rule will inevitably be doomed to failure, and Nepgear's rule itself would fall apart if she acted like Rei did while she was in power (a likelypossibility) or the Awful Truth, that the other 7 CPUs had to die to stop Arfoire, was revealed.
With all that in mind. It is very possible that the Zerodimension is a future where the Conquest End did happen and the result of that same ending.