A photography blog claims to have discovered a specs sheet for a new Canon sensor with a whopping 63MP resolution. This new module is intended for a full-frame (i.e. 35mm) camera, and has pixels of 37 micrometers in size. Should this leak prove real, this new sensor could compete well with new 60MP counterparts from Sony.
https://www.notebookcheck.net/Canon-is-now-allegedly-linked-to-an-upcoming-63MP-sensor.418835.0.html