Wow. Save Assassin's Creed and Mass Effect, I'm really excited for all the games on that list. Even though I never played fully through Half-Life, I would be excited for the third to come out.
Although I voted other. I've never played a 3-D FF game so although I'm excited for XIII I can't be TOO excited about it. Bioshock 2 looks fun but I'm too worried that it won't live up to the awesomeness that was the original Bioshock (and besides, the original devs aren't even doing this one). And Elder Scrolls 5 would be AMAZING; I loved Oblivion, and it was between that and Gears of War that my 2006 (I think) summer just flew by. Though I haven't played Fallout 3 yet, so once I play that (summer probably so I have enough time) I'm not sure I'll be ready already to play another huge open world game so quickly.
So the one I'm most excited for at the moment is Marvel Ultimate Alliance 2. I know, not the greatest game ever.. but as a form of entertainment for a huge comic book fan, the first was a ton of fun. And the controls were simple enough that I could play with my dad.. good times. Just yesterday I heard they announced that a new character not in the first will be in this one that I really wanted to be in.. so I'm super excited about it right now. (The character is Songbird from the Thunderbolts if that means anything to anyone here.)