IL2 sound engine was developed for security reasons, it was hacked early on in to the IL2 series then made secure again to stop cheating.
If you have an Soundblaster 5.1/Audigy/xfi series sound cards these really make the "stock" sounds a lot better than some "onboard" sound that come with motherboard manufacturers hardware.
I would think with the above points in mind I hope SOW follows a secure sound engine option with higher quality samples and a fuller range of sounds.