Apparently the Robert Pattinson Batsuit is being added to Arkham Knight. Someone shared a screenshot of the suit ingame that looks too high quality to be a mod with someone else sharing
Mod Corner: Best Batman Mods For PC Games To Celebrate Batman Day 2020 - Game Informer
Play as the Man-Bat in Batman Arkham Knight with this Awesome Mod
Batman Arkham Knight - Playable Characters Mod; Play as Red Hood, Nightwing, Harley Quinn and Many More
Batman Arkham Knight Adds Robert Pattinson's The Batman Suit As Part of a Free Update - FandomWire
Batman: Arkham Knight Mods - Original Red Hood Mod (Skin) - YouTube
Batman: Arkham Knight mod makes everyone playable | VG247
Batman: Arkham Knight mods to make the most of your next trip to Gotham
Top mods at Batman: Arkham Knight Nexus - Mods and community
Steam Community :: Guide :: Asylum Reborn - HD Texture Pack