In AW the Korea and WWI arenas were empty. HTC has too much on their plate now between trying to update AHII and TOD. In fact I wish they would put TOD back on the shelf for a couple of years while they fix AHII, update the current planes to AHII specs, add a bunch of new planes, and new maps.
If we could go back in time, I wish they had never even started on AHII but just kept updating AHI with new planes, maps, and bug fixes.
Korea and WWI are not going to happen for a very, very, long time.