Actually, it's PlayStation Day. :P
We'll probably see:
Killzone 2
Resistance 2
Haze (demo hits PSN tomorrow!)
Socom: Confrontation
LittleBigPlanet
(too many shooters :|)
Things I'd like to see:
White Knight Chronicles
Release month for Killzone 2
Infamous
A couple of new games announced (Socom and a bunch of PSN titles were first unveiled at Gamer's Day last year)