CanonNews has uncovered another patent on IBIS and IS working together in a future Canon camera.
This patent, according to CanonNews seems to be dealing with the potential of the composition to change as IS and IBIS work together while taking the picture.
Canon seems to have spent (since this application was submitted June 2018) a considerable amount of time and effort working out all the details necessary for the effective operation of dual IS before the first adaptation of it in a camera.
Because the sensor is deep inside the camera body in the diagram, also there is no pentaprism assembly and Canon specifically mentions an EV, this camera body appears to be an EF camera with an EVF. While it's certainly possible that Canon may decide to make an EF camera “mirrorless” it's altogether possible that this was just one of the various options that Canon was considering at the time of patent submission. Also, Canon most likely wouldn't have wanted to disclose to anyone that they were coming out with a new mirrorless mount through patent materials.
The patent details both the IS unit that exists in the lens, and also the IBIS unit that will exist in the camera body.