If you haven’t picked up last years Batman: Arkham Knight, you might to wait 2 months before you do.
Batman Arkham Knight was released last year in June, and was met with generally positive reviews, despite some divisive opinions of the implementation of the Batmoblie and the disaster that was the PC version of the game.
Going by other Game of the Year editions of games, it will most likely contain all the DLC.
It’s only $20 at GameStop, but you’ll be able to pick up a Game of the Year version of the 2015 hit in July.