I cannot wait to get my grubby mitts on this game, it looks absolutely awesome!
I'm really glad they finally worked on the vehicles as it's long overdue. High resolution dashboards, hands on the steering wheel and working mirrors will really help to make the vehicle combat more immersive.
There wasn't really much there on ragdoll though so it will be interesting to see more detail on how they implemented this. Physics has always been a problem in ArmA so any change for the better is a welcome change indeed.
I'd also love to see a demo showcase on the Editor, specifically the setup and usage of AI vehicles traversing a city scape. This is another area where the ArmA Series has struggled horribly, vehicles are completely ineffective and stupid in the city. They'll drive into each other, get stuck on buildings for ages only to damage each other then jump out and walk to the objectives.
Lastly, I'd love to see working inits or conditionals in waypoints and triggers whereby a vehicle can count as destroyed before it completes the waypoint or trigger. This has proven impossible previously so even a vehicle on fire won't count as destroyed because it never completed the waypoint/trigger.