Arkham City is barely a few months old, but Rocksteady
has already teased the follow-up. During Spike's annual Video Game Awards, an
obviously pre-recorded video of the Joker accepting his award for best voice acted
character in a game for 2011 "accidentally" started off holding the
wrong script, which happened to have the words "Arkham World" printed on them, to
which he then joked about spoilers.
No other information is available at this time.