We don't know when the trailer is coming out. Most people think that it's David Slade's (the director) job, but actually it's always the studio's job to come out with the trailers. Maybe that's why alot of the previous ones sucked.
Anyways, David Slade tweeted a couple weeks ago that the Summit and Co. are working at it. And he also said that he is working on the movie and that the editing/cutting is going smoothly.
It's been speculated that it might show up during Rob's new Summit movie, "Remember Me". It also has been said there will be a sneap peek on the New Moon DVD (french Version).
im guessing it might be soon as the director david slade tweeted he wwas planning a new years gift- meaning a trailer but the plan fell through. I dont tink he would've put that unless he had SOME idea of when it'd be coming out. ALso its less than 6 months and generally the teaser comes out around now-ish
I think there may be a full trailer with robs film- remember me- as summit entertainment are ethe company behind this film too
im guessing the teaser trailer will be shown at a awards show or something as they'll want as mant people as possible to see it, and im sure David Slade will tweet about when its coming so you could follow him if you dont want to miss it- david_a_slade@twitter.com