Batman: Arkham Asylum DLC you've been anxiously awaiting won't be exclusive to any one console. An Eidos employee popped onto the official forums to confirm that the free DLC would also be available for the PC at the same time as the Xbox 360 and PS3 console versions.
As nice as all that is, what we'd really like to know is: what is it? We're crossing our fingers for a Challenge room that lets us take on Alfred. Someone needs to put that smug jerk in his place for messing with the Batmobile.