The report over on Canon Rumors does not indicate any specifics about the Canon mirrorless offering, specifically noting that apparently the Mirrorless plan over at Canon is not finalized nor decided upon yet, so lots of conflicting information could come out in these closing months of 2016.
We had out own first hand look at the Canon EOS-M5 at Photo Plus last week and while our time with the camera was limited and had some odd technical difficulties, our general impression of the camera was positive. If Canon were to bring to market a similar offering with a full frame sensor and EF lens compatibility it is very possible they would have a winner on their hands. Though some would contend that having built in EF compatibility would defeat the purpose of a small and light mirrorless body.
Still, it would be an interesting development. While little is known about it at this time, we are pleased to hear that Canon is reportedly still looking into challenging Sony on the full frame mirrorless front. It will be interesting to sere what, if any, challenge makes it to market – if any.