With Batman : Arkham Asylum releasing June 23rd there has not been much announced since the Silent Knight gameplay demo. Eidos and Rocksteady have officially announced that the Joker will be playable in Batman : Arkham Asylum. But there’s a catch (actually two): First the Joker is only playable in the challenge rooms and not the main story mode. The second catch is that it is PlayStation 3 exclusive. The only other info Eidos has given about the DLC is that it will be available at the time of the games launch via PlayStation Network, and it will also be free.