San Diego Comic-Con News: Here is the three minute plus trailer for the fifth season of AMC’s The Walking Dead that was shown today at Comic-Con.  In addition to revealing the date on which the season debuts (Sunday, October 12th at 9pm, ET, PT), the trailer provides quite a few clues about the tense narrative arc of the 16-episode season 5, and even provides some clues about what happened to Beth Greene, played by Emily Kinney, who was kidnapped in Season 4 (see "'The Walking Dead' Round-Up").