No need to use the R6 sensor (the same of the 1D X Mark III) nor the one from the R5, it should be a very new sensor, what's is to be expected is the class leading R5 IBIS and the same or better shutter than the 1DX III, a mechanical shutter at 20fps is already the best a camera can get, could even be improved, but 20fps mechanical is already a lot, E-shutter could be (and should be) much faster, I expect this camera to be a lot better than the R5 and as a consequence a lot better than any other comparable camera, this will be expensive, but not in the class of the future R1, in the past the EOS 3 was the "affordable" EOS 1 with just few and minor features missing, I expect the R3 to be 4999~6499$ while the future R1 6999~9999$.
