According to member on the IGN Boards, he was watching G4 The Dark Knight preview with Kristin Holt interviewing Gary Oldman, who plays Jim Gordon in the movie. In the preview Gary Oldman told Kristin with loose lips that there really is “a Dark Knight Game in the works.” In the preview he joked about a “small scene in the game about his character on a roof top all alone while Batman jumped off the building and opened his wings to fly away to save the day.” He also talked about how it will look when Batman glides in the game. The game is set to be released around the same time as the DVD, near the end of this year.

Update:

A source close to Moviehole , told them "this morning that the film remains in-tact – and nothing of Ledger’s will be cut from the movie, including the body-bag scene. ‘’I KNOW for a fact that that scene is in the film. I also know that WB has made no such mandate and that Chris [Nolan] is honest when saying that he will not change what was intended with The Joker.”