Rocksteady have been releasing sneak-peek interviews on occasion in order to hype up Batman: Arkham City. Around E3 , we heard a nice interview between Dr. Hugo Strange and Catwoman, as well as Riddler, the Penguin, Quincy Sharp and Two-Face. And now it seems our psychopathic villain might be working with a dying Joker in order to do, er, something with Arkham City. It's all quite vague, but it's also hilarious. Have a listen, why don't you, and in the meantime be sure to check out the Batman wiki.
Source: Gamer Euphoria