FAKE! I mean, come on... they made a Joker pic which we thought could be real; now it's too difficult do make a manip of a f'ing bat logo?
Also, I really like the logo but why you think it's a screencap from a teaser trailer? Because of the black bars? Let's go back to Batman Begins: The first thing Warner Bros. posted on the official website was a logo. The same, exact logo (with the same background; title Batman Begins appearing later) also appeared in the teaser trailer which debuted in July. So, where's the difference? This is the new logo, we'll probably see it in the teaser trailer, too.