-How will the civilians work this time?
-Will they disappear from the map if you get far away enough?
-Will their AI just deactivate, or will they always be functioning and taking up CPU power no matter what?
-Will civilians carry on conversations with each other, or other factions?
-When submerged in water, do vehicles explode like in Arma or cease to function like in real life?
-Will water be affected by helicopter downwash like foliage is, or will there be a particle effect?
-Will rain still be inside of buildings, or has this been fixed?
-Will there be foam in the water around objects? Will picking up gear that's in the water damage your character's arms like in Arma?
-Will animals act realistically to danger, and run away? In one of the more recent previews, I saw that the cows didn't seem to notice the explosion. But that was the preview build. Edit: It's this preview. http://www.youtube.com/watch?v=vRhhG_IS5k0