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 fašade 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 fašade 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.