"No", says Nolan emphatically and unhesitatingly. He resists elaborating simply because, quite understandably, he says, "I just don't feel comfortable talking about it."
Since there is very little that is known about Batman 3, there were rumors of a potential presence by The Joker in the third film, but it seems they're moving on. We'll be sure to keep you posted on any further details on Batman 3 as soon as we have more information.
The Dark Knight Rises was released July 20th, 2012 and stars Tom Hardy, Christian Bale, Anne Hathaway, Liam Neeson, Joseph Gordon-Levitt, Gary Oldman, Marion Cotillard, Morgan Freeman. The film is directed by Christopher Nolan.