WB has no plans to rush out another Batman Movie once Chris Nolan has completed The Dark Knight Rises. Instead, the heads in power are looking at something to do with TV.
The idea comes from the successful tv transitions of SmallVille and Sherlock Holmes--the Hartswood Films/BBC Television show of the same name starring Benedict Cumberbatch that screened recently.
So, WB is looking at putting together a live action Batman TV series. The Head Executive in charge (name removed to protect source) who has overseen the development and production of such notable hits as: "Two and a Half Men", "The Mentalist", "ER", "The West Wing", "Without A Trace" and "Friends", has been given the task. He would like to keep it in line with the Nolan movies. No word on any stories or script, but he wants a real world feel with young adult audiences in mind".
It has also been mentioned that this is a way to re-introduce The Joker as a completely new version and not step on Heath’s memory/version, as WB knows this is a sensitive subject. They believe that the Joker alone will garner ratings through the roof and are already planning on a closed set with extremely tight security to prevent any leaked footage.
The Actor they have mentioned as a "type" to play Batman/Bruce Wayne is Karl Urban. Karl plays Dr. McCoy in the new Star Trek franchise.
Keep in mind, that this VERY EARLY talk, but if it is true that a WB head has been put in charge of development, it shows that they are indeed serious about a move to the small screen.