I agree with Nick. I would not expect WM to immediatly jump into any fairly new market. They are slow to innovate. That was never their interest. Their focus was to produce high quality sleeping bags. They did not innovate anything.
Nanatak is more innovative. I think they were one of the first companies to embrace quilts and half bags, more popular in mountaineering/climbing circles. They are much more innovative, but quilts/half bags were popular before they started manufacturing. Again, they don't really innovate, invent, test and market beta models.
Feathered Friends is about the same. They never liked to innovate. They took some tried and true products and simply made high quality varients. Again, walking bags, couples bags, etc have been around a while.
Z packs, EE, et al are even newer companies who use newer technologies as THEIR selling point. But is this ever really new? Yeah, DriDown is new enough, we still have 8 years to go before anything can be said about it as far as durability. Cuben is not the best for bags, anyway. Again, they don't have much to offer, so DriDown or 900FP is about it. But, Even Nunatak admits that 900FP down degrades more than lower fill 750 or 800FP down. The initial weight *might* be an ounce less, with more degradion over the course of a night.
DiDown and ilk are still too new for any to say, good or bad. Yes, the feathers resist water takeup for an hour or two. Tested and proven. Question: Why would this help? I try NOT to get my bag wet. Indeed, I choose fair to good ground to sleep on. I use a tarp. I try NOT to get stuff wet. Even if I dump my canoe, my sleeping gear is in dry bags. Most of my planning, and about a pound of my carry weight, is dedicated to staying dry through three days of torrential rains. Even with DriDown, this would not change. I try to sleep for 7 hours at a time, not for <2. The effect of DriDown on my gear is to pay extra for the treatment, since, I would buy a base 800fp down anyway.
The believe the increased loft associated with DriDown is due to changes in the surface nature of the static charges of the plumes, forcing the down to loft higher. Easy to test for with the current standards, since it is dried pretty thuroughly. But this fails in any sort of real world damp conditions because the charges can dispate before doing any usefull work, ie, seperating fibers in the plume. Down does this naturally, of course. Down bags in general will loft higher if clean and freshly dried. I have dried my bags maybe 50-75 times, they ALWAYS loft higher than when I got them new for the first night. Are they any warmer? Well, no, not really, since this effect disipates with contact, especially with my body. I believe DriDown, and ilk, is a gimmick, and not a true, real world improvement in down. It just tests at a higher loft. I think WM, FF, Nunatak, and others that DON'T use DriDown are using better knowledge and ignoring the marketing hype.
"Perhaps they just want your money any way they can get it." Ha, ha, I believe that is called wally world marketing.