A newly unveiled trailer confirms the upcoming May 29, 2012 release of Batman: Arkham City - Game of the Year Edition. In addition to an assortment of other goodies, the trailer also offers the first official confirmation that the previously rumored Harley Quinn's Revenge story DLC is an actual thing.
The GotY release will pack in all of the downloadable content released so far for Batman: Arkham City, including the "Online Pass"-style Catwoman pack and an assortment of challenge map packs for Robin, Nightwing, and assorted Batman skins. You'll also get a download code for the Batman: Year One animated movie. There's no word in the trailer of an a la carte DLC release for Harley Quinn's Revenge, but we'll be following up for confirmation on that, so stay tuned.