Update: It’s on PSN now. A mere 1.46Gb to you.
The firm said:
The Batman: Arkham Asylum demo will be available from August 7th worldwide for Xbox 360, PS3 and PC, however due to the nature of any global release, local times may vary. Gamers eager to get their hands on the demo should keep an eye on Xbox LIVE Marketplace, PlayStation Network and popular PC download sites for an update.
Get your eyes out, then, then. Go on.