The show goes on for the Vita, with or without Sony's developers. London's Radius Festival is taking place with Mike Bithell's Volume alongside a host of other Vita indies, if you're in the area, you can check out...
DiscStorm from XMPT
BodyCheck from Ludometrics
Mighty Tactical Shooter from Sock Thuggery (Coming to Kickstarter soon, maybe a Vita version)
And hopefully a few more.