It appears as though this movie is going to be a rewrite of episodes from Season 1. Which, to be honest, I am not very happy about. I was hoping to see a new original story. But who knows, maybe they will change everything about it. It is too early to say. And just to clear up confusion, no, this movie is not going to be in 2D. It will be a 3D animated movie. Similar to the actual Miraculous show.