The way I am reading things - and I admit that the following contains pure speculation on my part - I am beginning to believe that Maddox Games consider CloD a failed effort and not worth the hassle to fix it. Rewriting the engine (FM, sound, GUI ... anything left that'll not be changed?) tells me that the current engine is not salvagable. IMO the new management 1C got when it merged with Softklub last year is another factor in this (read: money grabbers).
If BoM is indeed all that Ilya wanted for CloD then that would be nice, but from my PoV - and I have been an ardent fan of the Il-2 series and I have done little bits and things for almost each version of the game, at least until Oleg departed - that product will have to be just as big a hit as the original Il-2 was. It needs to be thematically sound, needs to have all the relevant objects and aircraft, it will need a much less complicated and nerve-wracking GUI, it will need a campaign system that is worth the title ... In short it will need to contain everything that CloD is missing right now. That's a tall order, especially since Maddox Games was never particularly good at developing gameplay factors or not wasting effort on pointless objects/aircraft.