Absolute speculation, but, with the 1DX-ii out, and considering it has the same MP and similar specs as a "fixed" 7D-ii. IF Canon architecture is up to the task, I think it is reasonable the 7D-iii could be out within 6 to 9 months.
So, they both have 20.2MP, and there is nothing wrong with the ID of the 7D-ii except for the lack of a touch screen. So if the Mechanical Engineers and Product Engineers can sneak in a touch screen and leave the bulk of the tooling alone, AND the IC guys can get an APS-C 20.2 MP chip with on-die ADC ready. All you would have to do if figure out the thermal issues, if any, and copy over the schematic capture from the 1DX-ii (including the DIGIC 6+), and you could have a 7D-iii with DPAF with touchscreen, 4K crop video, and a few other little features that are on the 80D but missing on the 7D-ii.
Big risk items, working on the new sensor getting in the way of the 5D-iv's sensor, and other development resources, and of course thermal considerations for doing 4K video in the enclosure.
Canon is already discounting the 7D-ii. So that could be a fast track to keeping their flagship APS-C camera shining bright without a lot of risk or development time. It would truly be a slightly slower 1DX-ii with a APS-C sensor.
Anyway, just to through some gas on the fire.
So, they both have 20.2MP, and there is nothing wrong with the ID of the 7D-ii except for the lack of a touch screen. So if the Mechanical Engineers and Product Engineers can sneak in a touch screen and leave the bulk of the tooling alone, AND the IC guys can get an APS-C 20.2 MP chip with on-die ADC ready. All you would have to do if figure out the thermal issues, if any, and copy over the schematic capture from the 1DX-ii (including the DIGIC 6+), and you could have a 7D-iii with DPAF with touchscreen, 4K crop video, and a few other little features that are on the 80D but missing on the 7D-ii.
Big risk items, working on the new sensor getting in the way of the 5D-iv's sensor, and other development resources, and of course thermal considerations for doing 4K video in the enclosure.
Canon is already discounting the 7D-ii. So that could be a fast track to keeping their flagship APS-C camera shining bright without a lot of risk or development time. It would truly be a slightly slower 1DX-ii with a APS-C sensor.
Anyway, just to through some gas on the fire.