I would also like to see a Korean arena. It would be very interesting, and the Jets aren't advanced enough for the missiles to be super 1337. Could still dogfight the old fashioned way, and the use of helicopters and later versions of WWII planes would make it a place I would probably go to often.
If they did consider and go through with this idea it would probably be a long way off, but I'm content playing the game the way it is now in any case.