The 80D will probably have 4K video since I imagine that by then every one of their direct competitors will by the time it is released. Canon probably would have liked to include 4K with the 7D2 as well, but they were behind the curve and got caught flat-footed by Panasonic and Sony, and it was taking too long to retool the 7D2 to 4K so they dumped the current camera on the market to recover previous investment. The 80D will be what the 7D2 should have been, most likely fairly similar to the NX1 but a year later, just in time to see Panasonic/Sony/Samsung to move to their next generation of products.
I would question if the 80D will be released at all, since in all probability mirrorless cameras will have taken over that market segment by then. Cameras like the 70D are dinosaurs.