Bioshock Infinite.

So Bioshock Infinite looks completely awesome. Whatever that game is or becomes is beside the point right now. All that matters is that that trailer makes me want to play that game. It reminds me of Bioshock's trailer back in the day. 
 
For the record, I thought Bioshock 2 was pretty good. Its focus was different than Bioshock (1), but it was a pretty darn good game. If Infinite has the playability and fun of Bioshock 2, while having the story of Bioshock 1, I am totally pumped.