Next Batman Arkham game to be... a Prequel???

Variety just recently commented on what the initial plans for Warner Bros and Rocksteady's next Batman Arkham game, which is now highly anticipated after the success of the last sequel Arkham City.

If reports are true, the next game would take place during the Silver Years, where Batman first meets with the Joker. And if true again, he won't be fighting Joker alone! Justice League may somehow be part of the story. If they are playable within the story story mode or just backup like Robin (before DLC) and Nightwing was is still unknown at this time. The original Justice League consisted of Batman, Superman, Wonder Woman, Green Lantern, the Flash, Aquaman, and Martian Manhunter.

Game is said to come out no later than 2014...