I'm quoting this directly because this is the first site I've seen that prints this as fact and not rumor.
Sounds interesting. You gotta give Nolan credit for not pulling out the same old, worn down storylines.
The plan was to keep Joseph Gordon-Levitt's role in director Christopher Nolan's upcoming sequel The Dark Knight Rises a secret. The actor was confirmed to be involved with the project on Friday. Now, an insider from Christopher Nolan's camp has stepped forward to reveal more information about this trilogy ending sequel.
Joseph Gordon-Levitt will be playing Alberto Falcone, aka The Holiday Killer. The character figured heavily in the original comic book story The Long Halloween, in which Alberto, refused a place at his father's side in the Gotham Mafia, goes on a Halloween killing spree. He then continues to pop up on various holidays, taking out members of the criminal underworld. He is captured by Bruce Wayne after murdering Sal Maroni.
Tom Wilkinson portrayed Alberto's Mafia chieftain father Carmine Falcone in Batman Begins, which brings this trilogy full-circle. It is not clear at this point how The Holiday Killer will figure into the storyline of The Dark Knight Rises, which also includes villains Catwoman and Bane.
At this time, Christopher Nolan is continuing to fine-tune his script. Production on The Dark Knight Rises is set to begin later this year.
The Dark Knight Rises comes to theaters July 20th, 2012 and stars Christian Bale, Morgan Freeman, Michael Caine, Gary Oldman, Tom Hardy, Anne Hathaway, Marion Cotillard, Joseph Gordon-Levitt. The film is directed by Christopher Nolan.