Oh I can't wait for this movie, I absolutely love Matthias Schoenaerts since I've seen him in Rust and Bone. He is as you said so brilliant at expressing a lot though saying nothing. Very powerful and physical presence. I also advise you to watch Disorder if you haven't. It's an amazing take on PTSD affecting an ex soldier. The story is a bit secondary and goes haywire tbh but it doesn't matter much in the end.
It is not running here yet. Sounds like a must see.