Canon Watch is reporting that Canon has developed a new 21mp full-frame sensor and suggests we may see it in an upcoming EOS R camera.
New sensor specifications:
21MP full-frame sensor (6.4um)
120dB dynamic range (This translates to 20stops of dynamic range)
The image sensor may be based on the 2/3″ sensor shown for ISSC 2017.
I haven’t been told anything that confirms the above information, so please take the information with a grain of salt.