Is the next Batman: Arkham game called "Arkham World?"
Check out the Joker's acceptance speech for Best Chararacter at the 2011 Video Game Awards.
As we see the Joker toss the "script" aside, could this be a reference to the fact that Arkham City writer Paul Dini stated he wanted to do another DC Comics character's video game -- Superman!
Spoilers! Hey, He nabbed that from Doctor Who!