According to latest rumors, a new Canon EOS R Body with APS-C image sensor currently is in testing. This APS-C EOS R Body could be also a professional mirrorless camera, which means this APS-C EOS R body could be based on EOS 7D Mark II, for sports photographers.
Currently, there is still no reliable info about upcoming Canon EOS 7D Mark III. As Canon said before, currently they are focus on EOS R full frame mirrorless systems, there will be no new EF mount lenses in 2019. So we may not get anything about EOS 7D Mark III & 90D until in 2019. Stay tuned.