The trailer was pre-animated, meaning any scene shown there was only animated for the trailer, not to be included in the series. Rewatch the trailer, and you'll see all the scenes that already happened in the series look very different from the trailer.
I only hope that if they make a movie, they release it in Crunchyroll and theatres at the same time. I don't want to wait 6 months until they finally release the Blu Ray.