Well despite first party launch games only running at 720P, multiple third party games run @1080p. I only know a few right now, but maybe people can add games if they aren't included.
Right now the list includes:
Batman: Arkham City Armored Edition
Assasins Creed 3
Call of Duty: Black Ops 2
Monster Hunter Tri Ultimate
If there's any game you know that also does 1080p just comment.