We've now heard from two different people, that two different retailers are saying that the PowerShot G7 X Mark II is listed as discontinued in their computer systems.
The current PowerShot G7 X Mark II was announced February 17, 2016, so it makes sense that a replacement may be coming soon. The camera is now well past 2 years old. The original PowerShot G7 X lasted for 520 days before the announcement of the PowerShot G7 X Mark II.
We haven't seen any other leaks or information about a potential PowerShot G7 X Mark III, but we have been told that at least one G series PowerShot camera was coming in 2018.
We've been told by a few retailers that the PowerShot G7 X series has been the best selling of the refreshed “G” series of cameras.