The latest online downloadable content for DC Universe Online contains additional player versus player content AND Mark Hamill will provide the voice of The Joker again!
The Last Laugh DLC pack also features Arleen Sorkin, who returns as Harley Quinn, a role she played in Batman: Arkham Asylum. Adam Baldwin also joins again as Superman back from DC Universe Online.
The content is free for Legendary subscribers and can be purchased for free and Premium users via PSN and the game's website.
Source: Joystiq