Kotaku's Michael McWhertor is in L.A. for tonight's video game awards, where Mark Hamill told him he was asked to do a trailer for a sequel to Batman: Arkham Asylum. Update: Looks like that game has been announced.
That really didn't take long. The show opened with the announcement of Batman: Arkham Asylum 2. A url for the game: Arkhamhasmoved.com was given, but as of 6 p.m. Mountain Time I was still getting 404 errors for it.