Nepgear didn't exist when Compile Heart made Hyperdimension Neptunia, but Neptunia's little sister will be in the PlayStation Vita remake, Hyperdimension Neptunia Re;Birth 1.
Felistella remade Hyperdimenstion Neptunia for PlayStation Vita and instead of reusing the opening video from the PS3 game they made a new one for Hyperdimension Neptunia Re;Birth 1.
Hyperdimension Neptunia Re;Birth 1 like the other Neptunia games turns video game companies into characters. Although, the list of company cameos is different from Hyperdimension Neptunia.
Felistella is remaking Hyperdimension Neptunia for PlayStation Vita and the game has changed a lot. This video from Hyperdimension Neptunia Re;Birth 1 compares event scenes and battles to the original game.
Silicon Studio, the developer of Bravely Default, makes video games, but their specialty is developing tools for developers. Square Enix's Luminous Engine uses some of Silicon Studio's software and so does Hyperdimension Neptunia Re;Birth 1.
Hyperdimension Neptunia Re;Birth 1 has a new theme song called "Miracle Portable Mission" which is performed by Nao. Compile Heart also shared new screenshots of Leanbox from the PlayStation Vita remake.
Hyperdimention Neptunia Re;Birth 1 has a feature that wasn't in the original PlayStation 3 release at all. Dengeki explains the PlayStation Vita remake uses the Godly Game Disc system from Hyperdimension Neptunia V instead.
Felistella, developer of Summon Night 5 and Record of Agarest Mariage, is working on a PlayStation Vita remake of Hyperdimension Neptunia. The game has a new world map that's brighter than the PlayStation 3 version.
Summon Night developers Felistella are currently working with Compile Heart to develop Hyperdimension Neptunia; Birth 1, a PlayStation Vita remake of Hyperdimension Neptunia.