Re: The Joker sized elephant in the room
Logically, I think they will mention him. He is after all Batman's greatest villain. I have no doubt absent Ledger's passing, Joker would play a decent size roll in the third.
So I would think it would be done with Dialog. Possibly between Batman and Gordan towards the beginning of the movie.
This is your life, and it's ending one minute at a time. ~Chuck Palahniuk