Guarantee 7D III will have more AF points and slightly better DR hehehehehe.
Canon has been slowly steadily painting themselves into a corner. At some point they're going to be all out of things to upgrade besides the sensor.
The 5D IV should be interesting in that regard. Will they keep throwing cupholders at it? Will they, like 80's and 90's automakers, keep adding fluffy amenities, while failing to address quality concerns, and passing it off as an all-new product? Dual-pixel, GPS, even more AF points, all cool, all really nice, but it's just fluff. If their sensors don't take a significant step, then they'll be fatally rimrocked, while the competition keeps climbing up and up.