This is quite unexpected and may be just a glitch, but a trophy list appears when you look up Metal Gear Rising: Revengeance on a PS Vita system. See the picture below.
MGR: Revengeance was, initially, not developed by Platinum Games and it was announced for the hanheld, but the project was, suppossedly, cancelled long time ago, just when Platinum took the project.
Now this trophy list revives the rumor. Would you buy a PS Vita only for this game? I know many that would without any hesitation.