This is a trailer and 'first look' at the upcoming 2018 Batman Ninja, an animated movie in which Batman and other Gotham characters have all been transported to do battle in feudal Japan. It has a bunch of big-time anime names attached to it, and looks really promising. I'm optimistic, I just don't want to get my hopes up too high like I did for 2004's Catwoman.
Keep going for the trailer.
Thanks to n0nentity and Sarah S, for inspiring me to dress like a ninja all weekend (don't worry, my sword and throwing stars are cardboard).