Patapon 3 will become a PS Vita-compatible game next week. The news comes via the latest PlayStation Blogcast, episode number 62, wherein social media manager Sid Shuman and crew confirm the new PS Vita compatibility will be available alongside next week's PSN update.
Predecessors Patapon and Patapon 2 are both compatible with PS Vita. A multiplayer demo for Patapon 3 was issued ahead of its launch a few years back, though our quick check on PSN shows that free demo is no longer available.