Was wondering this myself.
All the hype and recent news has been about the Duo, which I am excited for, but October is also traditionally the time we see the likes of the Surface Pro being refreshed.
My Pro 4 is starting to glitch and was really hoping to upgrade but not sure whether to look at the Pro 7 or wait for the Pro 8.
The lack of any leaks or rumours for months makes me think we wont see a new version this year but would be happy to be proved wrong!