***COMING IN 2014***
Titled as "Batman: Arkham Knight", it's coming out for PS4/XB1 and PC so calm down and just enjoy the awesome next-gen-ness of this trailer:
It really does look next-gen (close to the division) and I can't wait for the gameplay.
Although this is probably a CGI trailer, I can't wait for what this game can offer.
This game is spearheaded by rocksteady, so I think it's safe for you to get your hopes up.
P.S. apparently the pre-order's already up although I wouldn't care about pre-orders if I were you. (play as harley quinn, really?)
P.P.S. apparently the story's set 1 year after Arkham City. They really have a lot of potential with this one so I hope they don't screw up!
update: the Batmobile is drivable for the first time in the franchise.