Batman: Arkham Asylum is the first to be outed; with the BBFC holding a classification for a game of the year edition. Usually these packs include some package DLC, but outside of two free PSN downloads and the Playstation's Joker content; there have only been two scarce challenge maps: the GameStop pre-order bonus "Dem Bones" and the Collector's Edition's "Crime Alley". While it's very likely the game of the year DLC will pack in such content as standard, we'd expect a little more.
Perhaps something new, a making-of DVD, or some skins for Bats? Guess we'll find out soon enough.