I am pretty sure that there is some kind of futuristic bullshit in there. I see weird looking pieces of equipment and guns in the trailer.
Also, please. I am 100% certain that every 2nd guy will run around with a submachine gun. Because "not being able to spit 1001010 bullets every second is not fun".
It will probably be a reskin of Battlefield 4, with slightly more bolt action rifles. And thats about it.
Tanks will move way to fast, airplanes will be way to maneuverable, both of them will be spammed, even though that is not accurate.
Additionally, every 2nd guy will have a sub machine gun, and even heavy machine guns will be movable or spammed around the map.
It also looks like every guy is wearing a gasmask. I bet gas attacks will be way to common in this game.
Most likely they will not include any playable artillery, because its "To difficult and to boring for the player" and simply rely on a general that can call in area bombardements.
They wont change the soldiers layout either. I am sure that you will be able to run around with one main arm, one pistol and a knife (Maybe a bayonet, or a club, who knows)
Super realistic.