Variety has learned that WBIE (Warner Bros. Interactive Entertainment) is set to introduce members of the Justice League of America in the next installment of Rocksteady's Batman series.
The entertainment trade magazine reports that the much-anticipated sequel to Arkham Asylum and Arkham City will, in fact, be a prequel centred on Batman's first meeting with his arch-nemesis The Joker. Stylistically, it's said to be based on the Silver Age era of DC's comicbooks, dating from the 1950s, when Batman first team up with other iconic DC heroes, like Superman and The Flash, establishing the Justice League of America.
Variety claims this is part of a conscious effort by Warner Bros. to expose audiences to the Justice League of America, as it ramps up production on a JLA movie. It also reports the game will be released in 2014 at the earliest.
from http://uk.ign.com/articles/2012/07/11/arkham-city-sequel-will-be-a-silver-age-prequel
If this real I don't know if excited or worried.