They don't need to worry about readout speed and fast tracking/focusing with an Rs camera. Once they have the sensor that can pump out that much detail they can plug it in to the regular R for the most part. But you can rest assured the Rx will come to market as soon as they possibly can. Canon knows the clock is ticking, even if they didn't seem to care about it 2 years ago. Sony has certainly lit a fire under that, but new sensor designs don't happen overnight.A matter of perspective I guess, looking at the 5D series the very high resolution sensor bodies were not the best selling items, and in terms of priorities the R series needs ASAP a 5D mk5 market segment body with the IBIS capability linked to a modern (i.e. more recent than the 5D Mk 4) dual pixel sensor, eventually with a very high resolution fast-reacting EVP. Dual cards is a hot topic ( not for me but it seems to be on many people's "must have" list) and faster continuous shooting (8-10 fps?) also. I associate very high resolution bodies with studio / tripod work using L primes and TS-E lenses, of which there are few in the RF lineup so far. Apart from the brilliant 50 and 85 primes most of the announcements for new lenses are zooms (trinity or not) for which the action camera is better suited.