After reading trough 30 pages.. some thoughts:
Market position
I think it's obvious that the R line is far away from the M line and more close to Canons FF DSLRs. And R lenses obviously more in line with EF than EF-M. If the body will really only be named "R" without number, i guess we will see more segmentation later. And like the M at the time it's a first shot and they will listen to feedback before developing a different form factor.
Lenses
Complete opposit of EF-M and a boom like 28-70/2. Would the same be (economically) possible in EF? AFAIK a lens must use a retrofocus/reverse tele for FLs shorter than the registration distance. On EF, 28 is within that range, on R it's not. All in all an impressive lineup. Maybe we will see cheaper lenses later, like variable aperture zooms and 2,8 pancakes or so.
Mount
I was a bit surprised by that move but if it enables lenses like the 2,0 zoom it seems worth the hassle. Also, we have to wait and see what canon has officially to say about the benefits of the new mount. A shorter mount is only usefull on short focal lengths, so i guess we won't see any big whites in R anytime soon. On the other hand, Canon could someday offer a EF to R conversion simply by changing the part of the lens body that the mount sits on or by bolting on a fixed, sealed and calibrated extention tube.
B.