Considering the limitations of traditional AF on large viewfinders (central point), the logical way forward for MF is high res EVF to enable accurate manual focusing.
I can see several ways to improve focusing precision with these high resolution sensors, but they all involve using the main sensor and so having no mirror in the way, and so would benefit from an EVF, even if only as an accessory for an SLR to improve the Live View mode experience:
- magnified live view for manual focusing
- on-sensor AF with CDAF and/or the newer in-sensor PDAF technology – which Sony has, so could offer in its larger-than-35mm-format sensors some day.
My bet is on CDAF, since AF speed is the main advantage of PDAF, and that seems a lower priority than accuracy in the larger formats, so the cost of modifying the sensor to add PDAF sensors is probably not worth it.
Apart from that, the main news from that Hssselblad interview for me is that Sony does indeed seem to plan on offering all its CMOS sensors to all makers, even if Phase One has a temporary exclusive, and the MF makes are all heading that way, phasing out CCDs. Given the higher overhead of developing each new CMOS sensor compared to CCDs, and thus the greater incentive to keep unit sales up for each sensor model (along with the desirability of matching wide-angle lens designs to a particular format size) I predict a settling on just these two sensor formats larger than 36x24mm: 54x40mm for approximately full 645 format and optimal usage of 645 lenses, and 44x33mm for lower cost "entry-level" options. (But always with Leica doing its own thing.) My only doubt is whether 44x33mm will persist or eventually get squeezed out for not offering a sufficient IQ advantage over the ever-improving 36x24mm offerings.