Batman: Arkham City - Game of the Year Edition is set to be released on May 29, in a collector's edition including all previously released DLC packs as well as the new 'Harley Quinn's Revenge.' Of course, fans who don't want to purchase the new collection, and only need the Harley Quinn pack won't be left out in the cold - it will be available for individual download on May 29 as well from XBox Live Arcade and PlayStation Network. As for the GOTY, check out this sweet looking trailer.