Two new
Neptunia spinoffs have been announced for release on the PS Vita,
Extreme Dimension Tag Blanc + Neptune VS Zombie Army and
Hyperdimension Great War Neptune Vs. Sega Hardware Girls. There's not a great deal of info on them yet, but Blanc's game will have some kind of multiplayer, and from what little gameplay I've seen, it also looks similar to the
Monster Hunter franchise. There's even less info on
Great War Neptune, and the only notable thing I've heard is that it will feature characters from
Sega Hardware Girls series, where Sega consoles are depicted as goddesses (similar to the Neptunia franchise, but specifically for Sega consoles).
Here's some gameplay for Blanc's game