The mention of Batman: Arkham World during an acceptance speech for Arkham City was a joke, publisher Warner has told VG247.
Whilst accepting his Character of the Year award at the VGAs this past weekend, Joker held a script titled "Batman: Arkham World" with a Rocksteady logo on the back.
The developer announced Arkham City at the 2009 VGAs, which may have added weight to Arkham Universe as a tease. Turns out it was all in good jest.
"What was referenced in Rocksteady’s acceptance speech was added in good fun only," a Warner rep told us via email this lunchtime.
Batman: Arkham City picked up three VGAs on Sunday besides Character of the Year: Best Action Adventure Game, Best Xbox 360 Game, and Best Adapted Video Game.