So according to their facebook page, we're getting the teaser trailer next week.
I'm not holding my breath for anything too in depth. I'm expecting something similar to the Hunger Games one where it was just a monologue and maybe a quick scene that tells you virtually nothing but still gives the fandom a heart attack.
I also know that this is a stretch, but I hope there's Magnus in it. It'll probably be Jace or Clary though.
This was posted on the facebook page.
They're saying it's coming out with Breaking Dawn Part II. But MTV will probably have it before then.
Anyways, I'm so excited!
I hope he can pull it off 
