There you have it.
I'm going with fake on this one. If there was a teaser for The Dark Knight Rises playing with The Green Lantern people would have already been buzzing about it last night and this morning. Plus, once it hit movie screens it more than likely would have been made available elsewhere. (Apple, Yahoo!, etc) Also, it's just too simple of a teaser. I couldn't imagine a teaser that did not even show the Batman insignia in some way.
Then again, I've been proven wrong plenty of times.
What say you?