There is certainly some good info in that video and link, but after seeing the game in action it's a bit frustrating that no one's bothered to clarify how the physics are handled. Everyone knows the gif going around of the body sliding on the ground in the latest trailer akin to something out of GTAV, which used a heavily gimped version of Euphoria engine.
For a game that's going to be loaded with new details, I really hope they don't forget (or exclude) a very vital one that made the previous Red Dead so much fun to play.