There is a Lot of information on this forum maybe you should at least read the updates before posting, or use search function.
http://forum.1cpublishing.eu/showthread.php?t=25222
2. Sound. As I’ve mentioned earlier, we’re completely redoing our sound engine from scratch. The work is being done in three stages. Stage 1, alpha, where we test basic functionality with some bare-bones samples has been passed a while ago. Stage 2, beta, where we have all aircraft sounds complete, and have some bare-minimum sounds for other objects, is almost here. Stage 3, a complete sound engine with all object and ambient sounds, will follow.
What we have now is brand new DB601, Merlin, Mercury, and Jumo 211 engines in a new environment, infinitely more stable and supporting realistic sounds from dozens or hundreds of engines within hearing distance. Various secondary and tertiary sounds are also there – G loads, flutter, controls movement, etc. The aircraft feel alive, especially when you’re inside the cockpit.
New sounds are being done by Valery Kornilov he has also made the sounds for ROF, and those are great.