io9 has done a walk-through of the teaser, looking for clues about the plot. I've been keeping some distance from sources during the making of the film just to maintain some surprise. Even so, there's not much out there to go on. Klingons appear in the film, and we see some in this trailer. A standard trailer will be shown with The Hobbit, and the first 8 minutes of the film with The Hobbit in IMAX theaters.
Another highly-anticipated film for 2013 is Guillermo del Toro's giant robots vs. kaiju epic Pacific Rim. Two "viral video" teasers:
From what I understand, Pacific Rim will be a conventional action film and not a "found footage" movie.