This new poster came from a BIG game store in the US for their march marketing
Take it all with a grain of salt. The user was only created within the last 24 hours and the source of the photo can't be verified. However, it could be that they're attempting to cover their tracks and the "BIG" game store is likely Gamestop. It is highly likely we will be hearing an announcement for the next Batman game soon as well, so it's entirely possible this poster is real. In addition, Gamestop Germany posted the following listing for Xbox One on their website in late January which was removed within a few days:
Rocksteady has just recently updated their twitter and a few weeks ago invited the press to view an unannounced game (Full Story Here!). The heat around the leaked poster could also be a hint and reference to Azrael's warning to Batman in Arkham City in which Gotham would burn.
So what do you think of the poster, is it real or fake?