A much higher price for the PDK gearbox in the flagship cars can be rationalized because the torque capacity must be higher, and then to offset the weight that capacity involves, a magnesium casing can be used. There are other ways to invent ways to make a 2:1 price differential seem unobscene but there's an example. I've long expected PDK on 987's to be about +$4500. And PAG will not simultaneously offer slushbox and PDK gearboxes for the same model, you can pretty much take that to the bank. As for cutover, who knows. I find all four key scenarios -- (1) simultaneous across all flat six cars (2) first in dry sump flagship cars (currently TT and GT2, since GT3 is done for now) then in split crankcase cars, (3) first in flagships, then in 997's, then in 987's, or (4) first in all 997's split crankcase or not, then in the 987's -- to be plausible. I think (2) is the most likely, for mechanical and logistical reasons (that I might spell out if I were inclined to bore the readership further...).