In my own experience, chosen carefully, some - but certainly not all - of the old V system lenses perform very well on a 60 Mp full frame sensor. I haven't heard many complaints about the CFV-50c crop sensor back (which has essentially the same pixel pitch as the new 100 Mp CMOS sensor), and lenses like the 40/4 IF, 100/3.5 and 180/4 (not to mention the Superachromats) stay pretty sharp out to the corners on the full frame sensor. I would think that diffraction will quickly eat into any additional gains in resolution one would realize by stepping up from 60 Mp to 100 Mp, in any case. Whether Hasselblad perceives a viable market for a full format CMOS to mate with the old 500 series bodies that are still in use, well, I guess we'll find out soon enough...
John