A lot of that would be considered refining an already existing game system, which has been happening a LOT since I started playing in A7.

Same can be said for the vehicles too (and I want to take a moment to point out how hyped I am for modding in custom vehicles!).
What happened with the skills is a complete change that I don't understand, especially since MM said in one of his earlier videos (I think it was the one where he showed off the new deer/doe model) that we would be getting an RPG-style system with skills and stats. That made me think we'd get the A16 system + what has been shown now... Which would just be way better imo.