Ok...let's phantasize further: I would build 4 faction old Coh2 style, releasing 2 at first and then another 2. For instance, I would release USF and Russia (Obama vs Putin lol) then after one year - one year and a half EU and China . Eu containing French, Germans, Brits, Italians, etc, as one faction.
Yeah I also though of a similar idea of 4 armies at the start US,Russia,Chine and NATO/EU with NATO/EU just being a generic collection of weapon system with the individual armies per nation being released later as DLC