According to a recently unearthed patent, Canon is actively working on shrinking the size of a full-frame mirrorless camera. We know that Canon is going to be bringing lots of new bodies above the current EOS R offerings, but it looks like there may be something to the thoughts that Canon may be working to add a camera below the EOS RP.
From Japan Patent Application 2019-184921:
An object of the present invention is to provide a technique for suppressing an increase in the size of an image pickup apparatus due to the arrangement of a motor for driving a shutter.
Canon News further breaks down the patent here.