Rocksteady Games has released two in-game costume skins for Batman: Arkham Knight. Yes, the 2015 game has just been updated for free. The update adds Zur-En-Arrh Batman and Anime Batman for all players. The latter is self-explanatory, but the garish Zur-En-Arrh skin is a deep cut from a 1958 issue of DC Comics’ Batman #113 in which Bruce Wayne is transported to an alien planet and given actual superpowers because that’s the kind of thing that happened in the Silver Age of funny books.
Both Batman skins were previously available only to players that linked their WB Games forum accounts to the game, but the latest version of these costumes come with no such restrictions. They’re just in Batman’s Bat-wardrobe for the Bat-wearing. The free update also removes Denuvo from the Steam version of the game. The Batmobile remains unchanged for better or worse.