Okay, I thought of 20 major current-gen games which I think are most likely to appear next (in no particular order):
The Elder Scrolls IV: Oblivion
BioShock
Call of Duty 4: Modern Warfare
Super Smash Bros. Brawl
Grand Theft Auto IV
Fallout 3
Uncharted 2: Among Thieves
Assassin's Creed II
Batman: Arkham Asylum
Left 4 Dead 2
Mass Effect 2
Heavy Rain
God of War III
Red Dead Redemption
Super Mario Galaxy 2
Halo: Reach
Dead Space 2
Pokemon Black/White
Portal 2
--
Currently Playing - Resident Evil 4
Hopefully Next Up - StarCraft, Final Fantasy VII, Resident Evil 2