The third New Moon Trailer focuses on Bella's stunts so that she can hear Edward's voice.  In the movie she not only hears Edwards voice, but Edward actually appears as an apparition.  We are also introduced to the Volturi in the third New Moon Trailer when Bella goes to Volterra with Alice to save Edward.  This is the last trailer that is being released for the upcoming New Moon Movie on November 20th.  You can see it below.  There is a short advertisement before the trailer begins.