From what I saw:
Pros:
Looks to have accelerating and decelerating
Parking system where the truck won't end up 90 degree parked perpendicular to the sidewalk making for easy pull ups
Lights look good
More realistic hose bend and physics
Hurst Tool comes with a generator
Stretcher system and animation look very cool
Map looks well made
Pedestrians and personnel look very well made and animations as well
Cons:
Trucks move unrealistically fast
At about 5:12 Im pretty sure I saw the guy walk through the truck
Seems to have the fire health system from Rescue 2013 (not a fan)
Emergency HQ no firehouses or stations etc
Looks like the world famous stationary 180 is back 8:35
My 2 cents. Glad to see they finally have gotten to this point with a completely redefined emergency game. I just hope everyone here realizes that its going to be a LONG time before it is up to par with Emergency 4, mods and all. All scripts, buildings, sounds, commands, vehicles etc that were made by the first nodders in EM4 are going to have be relearned and redone for EM5. Don't expect to load up EM5 and be playing LA Mod anytime soon. Things will be different and things will take time. Be ready to be playing default EM5 for a while. Making new maps shouldn't be difficult but when it comes to reshaping the game into an american mod or making new vehicles, its gonna be a while. 