Personally I think this isn't a true Arkham. My theory; Joker has created some kind of base of operations in a part of Gotham and has named it Arkham Asylum: For the Criminally Hilarious or something like that.
I was hoping for Batman: Gotham City, but maybe this will be essentially the same thing. It's basically looks like it takes place in Gotham, or at least a part of it. I doubt it will be open world though, as I thought it might be, but there's nothing wrong with that.
benbenthegamerman said:
probably being fixed, what with Poison Ivy sort of, yknow, destroying have of the island/facility.
Actually, I like this theory better. They can't keep the inmates contained with all the damage that's been done so they move them to a part of Gotham, with hilarious results (for Joker anyway).