Called Hyperdevotion Noire: Goddess Black Heart (also known as HyperGoddess Noire: Super God Black Heart), the game is a strategy RPG taking place in Gamarket, a similar, but separate world from Gamindustri.
Hyperdimension Neptunia Re:Birth 1 Gameplay Trailer
Within Gamarket, four nations are at war for domination, but are
later forced to unite in order to save the world from an even greater
threat. Built around a turn-based battle system, Hyperdevotion Noire is a
strategy game featuring the ability to control units, build
relationships, customize items, and swap between game modes.Hyperdevition Noire: Goddess Black Heart is the first official strategy RPG in the series. It will be available exclusively on the PlayStation Vita in North America and Europe early in 2015.
For more on Hyperdimension Neptunia, check out IGN's official review of Hyperdimension Neptunia: Re:Birth 1 on Vita.