The purple jacket on the man in the background could indicate he's Joker. Or that he plays for the Lakers.
Giving a statement to USA Today, The Dark Knight director Christopher Nolan revealed he'll be shooting four action sequences, including the scene introducing Joker, in IMAX format. The scenes will be granted an enhanced crispness and clarity due to the large format, so to juxtapose this, we've been given some blurry shots of what may be the Joker's introductory scene. At least you can see his hair is green.
But does the carpet match the drapes?