mercedes doesnt need to offer a dual clutch setup. theyre running a business, and their target demographic of middle aged white people with alot of money buy the cars for comfort mostly. thats the appeal of the mercedes, is the effortless speed and smoothness. the auto boxes they have accomplish that very well. in a mercedes there isnt any drama and there never will be, which is good or bad depending on your taste.
to guess, i would say this new type of tranny will be on AMG models only, possibly only the high end ones, and cost a pretty penny.