Everything in the trailer reflects something that happens in the movie. So you know, with those 2 characters something is going to happen with a whole, and an explosion
I don't really understand why a part of the floor falls away, a stormtrooper falls into it, then Boba flies into it then out again?
Oh, and notice when hes falling (if you can see it) there are det packs in his hands. He sets them inside of the hole.