User blog comment:Akin.toussaint/Trailers.Did they do more harm then good?/@comment-3387274-20131013141041/@comment-2135507-20131014051244

Look at the intervirews page of the wiki Akin. It is in fact stated in several interviews.

Monty stated that the Red Trailer was to hint at the action, character, design, and most importantly the weapons. Weiss' trailer was thought to do pretty much the same thing. Blake and Yang's trailer both conveyed more of a plot and setting device and well as showing off more of the personality in the characters.