God of War III - It's God of War for sure. It looks a ton better, but plays the same. If you enjoy God of War, you will love this game. Go buy a PS3. If you hate God of War, there's nothing new here for you except quick time events are a bit easier.
Halo 3 ODST - It's Halo 3 but without armor or regenerating health. I'm not sure I see a reason it's interesting, though it still has a very Halo feel. I only got to play their version of Hoard Mode (if you ever played Gears of War 2) so maybe there's more stuff.
Borderlands - Looks great. I am going to actually play it today, but what I have seen looks very cool.
That was lame, but there's more to come probably!