Yoshiro Kimura headed this game with Cing, Town Factory, and other assorted developers; he's since left Marvelous for Grasshopper Manufacture, and Cing has gone bankrupt, leaving the identity of this game's developer somewhat of a mystery. Of course, it's premature to worry about things like that when we don't even know the game is real, something we're attempting to confirm with Marvelous now.
Update: Andriasang has more details. Konami is publishing the new game instead of Marvelous, though Marvelous is still involved in some way. The Vita release has more "realistic proportions" in its characters, and a full touch-based control scheme. And it'll be playable at Tokyo Game Show in Sony's booth.