Arma III seems like it'll be Arma 2.5 they're just not taking an aggressive enough stance to bring it into the realm of modern fps games. Player movement while improved is still clunky, the UI is still an excel spreadsheet. All that command interface stuff should be scrapped, how many people take command of hundreds of units at once?
Drives me nuts because underneath all the many layers that are the Arma Onion you could have one hell of a Battlefield killer. A target that BiS should have set out to match is Novalogic's Joint Operations - that game was tactical and fun to play. It'll never happen unfortunately because BiS is still concentrating on Man Simulator 2.0