Exciting! I am glad this actually gives them time to work out all the details which would result of a more fine-tuned product in the end. Hope R1 will solve some of R5's pains in that it will have a bigger body, but given the weathering sealing, one might not expect magic when it comes to heat dissipation.
All Canon needs to do is put in a BIG high nickel content stainless steel plate on the bottom of the R1 that will act as the out-to-air thermal output of a BIG Internal Heat Sink for the internal high-heat-producing CPUs and RAM memory of the camera to give it a full non-overheating 12-to-16 hour shooting day typical of news reporting and sports/action workloads!
If Canon does that along with 60 fps fps DCI 8K 8192 x 4320 pixel video capture and 30 fps Burst rate Full-Size 3:2 stills, the R1 will be a total PRO-CAMERA category winner!