One of the more exciting games to come out this year for me is
Portal 2. I really enjoyed the first one and from all the talks of the second game, it sounds like it's really going to top the first. The co-op aspect also has me intrigued as well.
Game Informer has a look at how Chell, the main character from the first, has gone a redesign as well as the look of the co-op robots in the game. Valve even thought about doing a brand new main character but ultimately decided on going back to Chell as the protagonist, a good move in my opinion.