As you can see in the image above, Joker is holding a teaser script to what many believed to be the next Batman game, Arkham World. In an email sent to VG247, A Warner Bros. rep said this:
What was referenced in Rocksteady’s acceptance speech was added in good fun only
That’s a true bummer. Seeing as how Arkham City was announced at the VGA’s in 2009, many thought it to add to the validity of this tease.