The lens still has to autofocus, and not will all the elements moving together (which also means that it can only be optimised to one distance).Not necessarily, as there is no moving mirror there is nothing to stop the lens rear element protruding well behind the mount, as in the Leica designs. The shutter in the R is probably no more the a couple of mm forward of the sensor so potentially 15mm of recess is possible, this would mean even a 10mm focal length design could be made that wasn't a retrofocus. That is probably too much but I can see a focal length of 14mm non retro focal being very possible.
While Zeiss kept the Biogon design for the 35mm Loxia they've changed to the Distagon with the 21mm Loxia, which implies that even for manual focus lenses it may not ultimately be the best choice for performance, which is what Canon is aiming for.
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