i'd have to say lbp vita, dragon crown and metal gear collection

Of all of the PSV games announced, Gravity Daze stands out as the crown jewel for me and my tastes. I'll probably grab that. Of course it depends on the reviews, though.

1. Ultimate Marvel vs Capcom 3
2. Katamari Damacy
3. Hot Shots Golf Next
4. Virtual Tennis 4
5. Dragon's Crown

I don't wanna ignore the apps. Monster Radar in particular looks like a cool location based Pokemon type game. The others without titles sound interesting and I don't think they should be discounted because they aren't full retail titles. The large amounts of downloadable games is one of the positives for Vita.

Hmm based on the japanese launch titles, i am interested in
1. Uncharted Golden Abyss
2. Disgaea 3 Return
3. Little Deviants
4. Ridge Racer
5. Ultimate Marvel vs Capcom (not gonna buy PS3 ver if can crossplay)
6. Hot Shots Golf Next
7. Army Corps of Hell
8. Lord Of Apocalypse

The list may change when reviews come out though.