Was originally supposed to be released on July 23, 2016, but it was postponed in order to the developers to make the game look more polished after fans criticized the game for not looking complete.
Rain was added to Arkham Asylum in the outside areas as part of this remaster. In original promotional art for the game and in some cutscenes, rain can be seen a few times but was never used in game. Some guards and a few inmates can also be seen wearing raincoats a few times in the original game.
First Batman Arkham game to be developed using Unreal Engine 4.