I think Black Ops is going to own Killzone 3-- Treyarch has had over 200 people working on Black Ops for 2 years now.
I agree with many other posters above-- Killzone 3 is game to play once it hits the bargain bin. I hope the developer surprises us, because I thought Killzone 2 was pretty uninspired. I'd rather play MAG any day of the week.
Most anticipated games of 2011:
Uncharted 3,Legend of Zelda: Skyward Sword, Rocksmith
Modern Warfare 3, Super Mario 3D