This trailer builds up a situation immediately showing characters, what the film is about and many significant shots.  Dramatic music and dialogue builds up the footage and the tension within the trailer.  This creates a level of understanding of that we know what is to unfold to a certain extent if we see the film.  This means the trailer has to be very intregueing and exciting in order to persuade people to the Cinema.  In my opinion this trailer appears to give too much away, but I have not seen the film and so therefore i cannot judge accurately.