Action game is currently in the works for PS Vita
In addition to the previously reported Sega Hard Girls crossover, another new Hyperdimension Neptunia game was announced at the Dengeki Bunko Spring Festival 2015. Compile Heart is working on an action game called Extreme Dimension Tag Blanc + Neptune VS Zombie Army, which, as you might have guessed, stars Blanc and Neptune.
The name may be tentative, but it offers a pretty good idea of what to expect from the PS Vita game, which will also include multiplayer. More info to come later, but for now you can see the reveal at the event in the video below.