I hate for this to sound like a complaint, but will there be continued development in the WW2 planeset? There are still some planes that would make for great additions to fill out the scenario planeset, even if there really isn't anything left that would see use in the MA's.
Just off the top of my head, the Japanese planeset could use the Ki-27, Ki-43, Ki-44, and Ki-45, along with the G4M "Betty".
The British could use the Beaufighter and a couple different marks of the Mosquito at least.
The Russian planeset could be filled out in the early war with an early Yak and a MiG.
The only missing plane that I think would see any significant use in the MA is the P-63, that could also be used in a few 1945 scenarios.