This sim is called Knights of the Sky and it seems that it now uses its own engine instead of the Il2 engine. There are 3 WW1 flight sims coming out- Over Flanders Fields: Phase 2, First Eagles and Knights of the Sky.
I made a thread about all these WW1 flight sims:
http://www.ww2aircraft.net/forum/il...-air-over-flanders-fields-phase-2-a-5899.html