I did read somewhere, somebody saying that they didn't think this product was aimed at serious audiophiles because who puts a single chip sabre dac in a system like this, and instead market things like "the same marble used in the statue of David" and motorised tubes that rise up out of the chassis... Valid point.
OTOH, (my experience with dacs is limited, but) I couldn't really tell any difference between Violectric's V850 DS DAC at $2k Aussie and Schiit's Yggy Multibit DAC at $4k Aussie in a volume matched, instantaneous input switching situation in a quiet shop... Which kinda supports what the guys in the sound science forum will tell you. So maybe Sennheiser is on that side of the fence and just doesn't consider it important or think it makes any difference?
One other thing worth noting, is that considering this system was 20 years in the making, they probably didn't anticipate that purrin would come along and get in Schiit's ear and convince everyone on head fi that you had to have a multibit dac, and now all of a sudden everyone seems to care, when nobody did 2 years ago... Maybe the final production version will go multibit just to silence any possible criticisms...