I think Sony was pissed with all the delays last year and are now making developers give solid release dates long in advance and stick to them.
Exclusives already released in 2011:
LittleBigPlanet2 (LT-2.8m that's what you get for missing xmas)
Killzone 3(LT-2m unless bundled)
Yakuza 4 (LT-not sure)
Exclusives Still to Come in 2011:
Move Heroes (LT-0.7m)
Release Date: March 22, 2011
MotorStorm Apocalypse (LT-1.5m)
Date: April 12, 2011
SOCOM 4 (LT-2.7m socom has a solid fanbase and Move will give it good legs)
Release Date: April 19, 2011 (same day as Mortal Kombat w/ exclusive Kratos)
Infamous 2 (LT-2.4m.... better reviews and higher user base this time around)
Release Date: June 7, 2011
Resistance 3 (LT-1.5m)
Release Date: September 6, 2011 (a week before RAGE)
Uncharted 3 (LT-5.1m)
Release Date: November 1, 2011 (same day, or a week before MW3)
Unknown Release Dates:
Twisted Metal (LT-2.0m)
Release Date: September-November 2011 (Jaffe says it's definitely coming in 2011)
The Last Guardian (LT-1.3m)
Release Date: Q4 2011, I wouldn't be surprised if it gets pushed to 2012 in NA/EU
Sorcery (LT-no clue)
Release Date: July-September, 2011
Ratchet & Clank: All 4 One (LT-1m)
Release Date: October-December 2011. Insomniac will not miss Xmas