The Riddler In The Dark Knight Rises?

Is there a third villain in The Dark Knight Rises?  Is Joseph Gordon-Levitt going to play that villain?  Or is he going to play another role?  No one knows really but he is in talks with director Christopher Nolan to play a role in the upcoming Batman sequel.
     Deadline says, "Joseph Gordon-Levitt is in talks to reunite with his Inception director Christopher Nolan in The Dark Knight Rises for Warner Bros. I'm not sure what role he'll play, but I'm told that he will be in the movie when Nolan starts production this spring."
     Rumors suggest that The Riddler may be in the film also but of course no one really knows except for Nolan himself along with his screenwriters and close friends.