OP you forgot Grand Theft Auto: San Andreas (BEST GAME EVER) due out June 7th.
BTW, I expect these to be great:
Mercenaries (Demo is great on PS2)
Half-Life 2 (PC Game Rules)
Oddworld Stranger's Wrath
(I liked the first 2 oddworlds and this one looks promising)
Conker: Live and Reloaded (Huge fan of the previous game)
Star Wars Republic Commando (The demo is pretty fun on KOTOR2)
Metal Slug 4 & 5
(I've played 4 in arcades and I like it a lot, but not as much as 1,2,or X)
Star Wars: Revenge of the Sith
(Made by the Collective, who is great at Melee Combat in Indiana Jones & Buffy)
EDIT: I noticed Conker is the only exclusive in there, but I expect it to be fantastic. This year may be better than last year as DOA Ultimate & Rainbow Six 3 Black Arrow were last year's only great exclusive (Ultimate wasn't much of an improvement over DOA3).