I don't know if I'd want Bioshock Infinite over an original Vita Bioshock.
KillZone looks stunning, but it helps that the levels are built around the console. I think Bioshock Infinite would require a massive downgrade in visuals.
I am keen to see how Borderlands 2 turns out though. I really enjoyed the original, but never got around to playing the second so am holding out for the Vita version now.