Well don't get too hyped up from that...the only things there that weren't pre-rendered were the Unreal 3 tech demo, the Fight Night demo, and I'm not sure about the bathtub thing. The rest was pre-rendered...I don't know whether it was pre-rendered on PS3 hardware or not, but it was just a teaser.
As for Killzone, it looked awesome, but thats not gameplay footage, and I doubt the actual game will turn out that awesome. One thing that's a dead giveaway that it's not actual gameplay is the fluidity of the movement of the character...that's impossible.
I'm looking forward to the PS3 though.