I would like to see Arad, to be honest. Not the normal Arad, but one of the Arad Real Forests ( I forget which one it was, but there's one where you don't have any sort of "solid lump of trees", it's a bit more realistic with most trees having a good 3-5 feet in between them. It's not the one that's running on the 24-7 Arad on RO:Ost. ) I think that with the great improvements to the basic bolt action rifle targeting, the wide open spaces will provide an interesting new game play.
Of course, it may turn into what happened in RO1, where trying to go out as infantry rather than a tank means you get sniped from across the map, but then again it might not.