Sound is increduibly important for creating atmosphere, we all know that. I wonder whether SoW:BoB will have a great in-flight chatter pack, to make those days of 1940 come alive, viscerally, in our headphones. Fellow pilots, female ground controllers, etc, in all their glory.
We need something like the In Flight Funk German chatter pack:
http://home.arcor.de/nsu-binder/il2-funk/Demo1.wav (Sound example posted by NSU)
Even better of course to have this combined with correctly generated in-game calls of equal quality.