As far as the main story goes, there’s a new story with extra little events added to each chapter, along with a new scenario that unlocks upon beating the game once.
Compile Heart and Felistella are working on bringing Hyperdimension Neptunia Victory to PlayStation Vita. This version, Hyperdimension Neptunia Re;Birth3 V Century, has a new opening movie, but you don't have to wait until December to see it.
By the end of this year, all three Hyperdimension Neptunia games will be on PlayStation Vita. Hyperdimension Neptunia Re;Birth3 V Century is a port of Hyperdimension Neptunia Victory with a new opening video and an extra storyline.
All three Neptunia PlayStation 3 games will be remade for PlayStaiton Vita. Hyperdimension Neptunia Re;Birth3 V Century is scheduled to come out on December 18 in Japan.
Compile Heart and Summon Night developer Felistella remade the first two Neptunia games for PlayStation Vita. This December, the Neptunia trilogy will be complete when Hyperdimension Neptunia Re;Birth3 V Century comes out.