a remake of the second game
in the Neptunia series is on its way to the Vita. the name may change, they are saying it could only be a placeholder to hopefully a less confusing name. of course, why would the remake the second game and not the first?
Hyperdimension Neptunia mk2, a PlayStation 3 Japanese role playing game developed by Compile Heart and Idea Factory, is making the leap to Sony's Vita handheld as Hyperdimension Neptunia Re; Birth 1.
but then another site
Hyperdimension Neptunia Re; Birth 1 is a remake of Hyperdimension Neptunia for PS Vita. At the Tokyo Game Show, Compile Heart announced Hyperdimension Neptunia Re; Birth 2, a remake of Hyperdimension Neptunia mk2 for PS Vita.
so I'm guessing the first article mistakenly meant Birth 2 in the quote, and a Birth 1 is also on the way...
EddieA is knowledgeable about these things, maybe he can shine some light on what is what