The plan is to get the weather working for the sequel, and as COD will be merge-able with the next instalment the weather (and other improvements + updates to the engine) will be usable in COD too.
So, we'll get it, but it's going to be a waiting game.
I'll also speculate that when they introduce cloudy/overcast, stormy, etc conditions that they will have to tweak and 'recalibrate' the lighting settings - and this should mean that the current slightly over-dulled, pastel effect for COD's perpetually bright sunny skies will be redone and improved as well.
And as the Russian Front will have both winter and summer conditions they will also have to re-work and fine-tune the current always-high icing settings for clouds. So no more icing up flying through British summer clouds.
In fact, since coming to terms with the probability that most of what I want will be supplied in the sequel I have been enjoying a near-Buddhist state of contemplative tranquillity regarding the current state of COD and no longer care about Beta and Steam patches.
