We get a bit of a breather with this expansion. The first trailer was incredibly bleak with no room for humor (unless you count Mattie Ross trying on her hat). This one lets us know that, despite the grave mission of these folks, there will be room for levity (as was the case with Kim Darby and John Wayne).
I hate the fact that the trailer gives away a major plot twist, but I'm sure there's just as much being held under wraps. My faith in the Coens remain eternal (Intolerable Cruelty notwithstanding):