AnentCanon tends to update their **D series camera every year to 2 years so the next **D camera should be coming out in less than a year. That said the 80D is still a superb camera and fits between the 77D or T7i and the higher end 7D Mk II or 6D Mk II.
AnentIt's unlikely. Canon has a slow release cycle, much like Nikon. The 6D mk II for example, didn't come out until 5 years after the first one. If you go by that, you can expect a new 80D to be released in 2021.