Frank Darabont‘s The Walking Dead had a trailer premiere via American Movie Classics (AMC) at the 2010 San Diego Comic-Con 2010. There was no need to show the various pictures at the trailer premiere as avid fans had already seen them before. The Walking Dead trailer has not been officially released yet but a spectator at the trailer event recorded it and uploaded onto Youtube. Check it out below. It probably will not be up long. The Walking Dead premieres on AMC in October 2010.
Update: The official trailer has been added.