Now according to the folks at Canon Rumors, they have heard from a source that Canon’s development of their high-end full-frame mirrorless camera is progressing nicely, and that the camera is said to have already found its way into the hands of select Canon professional photographers for testing.
The report claims that Canon has been very forthcoming about the camera’s development with professionals simply because they want to make sure they “get it right”, versus launching a first-gen high-end camera only for it to flop. Unfortunately apart from the rumors of the camera being in testing, not much is known about the camera and its specs.
Presumably any available information right now will be subject to change as Canon goes through various iterations ahead of its launch, which based on earlier rumors could take place in 2019. Until we get the official word, it’s best to take this with a grain of salt for now.