Update: Looks there there are some Fan Made trailers with music added to the original test trailers. Enjoy.

Looks like a really cool and interesting project that got Cancelled. Wes Ball the director posted to Youtube a Previs Reel. Most likely done in Unreal Engine. Weta was also involved in the Prep of the project.
Got to be the coolest Realtime Trailer. I give it a 90% for the graphics quality its every good for a realtime graphics, I would not mind just reaching this level of realism. #previs #unrealengine. Seriously it could be a game of its own.
Unfortunately this project may have gotten shuttered during the Disney Fox Merger. Tone wise it was not going to fit the family friendly stories, more like a Aesop Grim Tales Fables kind of story.
I wonder if this project can be kick started through using tech like Blockchain where audience and creators have some stake in the project. Even if it gets released on the web.
“The trick with this one is we have to thread that needle with tone,” he explained. “I’m not interested in doing a DreamWorks or Pixar-type movie, I’m interested in doing something closer to Planet of the Apes where you’re really gonna nail characters and show the harsh reality of what they live in. It’s gonna be a little bit of both, probably, but at the same time because of the cost I need as big an audience as possible. So I want 10-year olds to see this as much as 40 and 50-year olds, you know? That’s the needle we have to thread, but for me personally… the way Star Wars appealed to me as a kid growing up hit that tone in a weird way. It appealed to the kid in everybody but still took itself seriously. That’s really exciting to me, that kind of film, that kind of target, but obviously set in this really harsh world of mice and swords.”
https://comicbook.com/movies/2019/06/26/mouse-guard-movie-spoilers-disney-fox-production-concept-art/
https://www.syfy.com/syfywire/mouse-guard-concept-art-fox-disney