I think S-E had already finished calculating what kind of games will fit for the Vita. Seeing them actually start from Lords of Apocalypse to Million Arthur to Chaos Rings PSM to Chaos Rings port + F2P Mana to this, makes me have a little hope that they'll continue bringing games to the system.
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J-Stars Victory VS+ and One Piece Pirate Warriors 3' vita versions are leaving Japan. Actually psyched about J-stars (played itñ at a local vita group meeting for Toukiden LOL), I'm a casual Fighting games fan though so impressions of it might change for someone who's deeply into fighting games. Victory VS+ is an expansion.
Sources:
Bandai Namco Announcement
J-Stars Neogaf Thread
One Piece Neogaf thread
EDIT: Thanks for the tip baekshi!