With the current technology, I want to see a 51mp full frame sensor, same in my 5DSr, but better ISO, better dynamic range, redesign the low pass to be variable, add focus peaking, improve the viewfinder whether mirrored or not, but do not go past 60mp or so unless you put 4 DIGIC 8's in it, haha. I like my 5DSr, but it could be SO MUCH BETTER, and do not get me started on its weaknesses vs its unique strengths. I am going to call bull&#%* on this one because I don't think Canon has solved their biggest engineering problem yet, and when they do, it will be to reveal a mirrorless 1DX that far surpasses in burst speed a mirrored 1DX, and look for it to shake up the market like EOS/EF did back in '87. They wouldn't waste a clever engineering work-around on introducing an APSC sensor if the technology that enables that high mp/burst shooting/pixel density also works too on full frame and ff mirrorless. A Canon sensor of 32mp APSC certainly is a bad step Canon WOULD make, Canon having not a distinct clue what they are doing when it comes to body/sensor design and what people want, but some of the R/RP/RF designs seem to have had user input, so maybe that is all the more reason a 32mp apsc is not happening.
Bottom line I just don't see that happening on an APS-c. They really need to reassure the product/landscape shooters that want a pro-level high-mp body that they are working hard on a solution, because I see all my EF L glass, and I look at my obsolete mirrored 5DSr, and medium format is starting to look tastier and tastier. Please Canon, please......