Presumably it will be available then as premium content, meaning Arkham Asylum gamers will be parting with some cash - where as PS3 gamers have it as a complementary download.
"You've heard The Joker is playable in Arkham Asylum on PS3, right? Those stages are DLC on 360. It's our May covergame; look forward to it," tweets mag .
This is at odds with Eidos' previously released statement where they clearly say the Joker will be coming to Arkham Asylum - "but only on the PlayStation 3." The May issue of XboxWorld360 should hopefully clear things up.
Batman: Arkham Asylum is being released on Xbox 360, PS3 and PC this June.