There's a lot to unpack from their preview and I hope something things survive (i.e. encumbrance system seems to be a shift toward less tracking/inventory management, which I think could be good) and others get refined (i.e. either more branches applicable to more nations, or just go with generic 'Marines/Naval Infantry, Army, Navy, maybe the Air Force?, and let it apply to all relevant nations).

I don't think it serves the game to be so U.S. centric, especially given the the world has gotten smaller over the decades since v1.0 was published; development is being done in Sweden and not Illinois for heavens sake. 2013 did a great job with this in that their career paths are not country specific.