There's a rumored FF mirrorless body to be released in 2019 (source: mirrorless rumors). It has 26 megapixels, and that makes me very suspicious.
Given Canon's track record of making people's worst fears come true, as well as their habit of using old sensors, that were mediocre back in their day, in their new bodies (modified 5D IV sensor in EOS R), I wouldn't put it beyond them to reuse the 26 MP 6DII sensor in a new FF body in 2019 (as well as crop the 4K and all the standard missing features).
If they do that, I swear to god Canon...
Given Canon's track record of making people's worst fears come true, as well as their habit of using old sensors, that were mediocre back in their day, in their new bodies (modified 5D IV sensor in EOS R), I wouldn't put it beyond them to reuse the 26 MP 6DII sensor in a new FF body in 2019 (as well as crop the 4K and all the standard missing features).
If they do that, I swear to god Canon...