Everything official I've read from Microsoft says that "Windows 10 is the last version of Windows" and that basically future Windows versions will just be upgrades to 10. I suppose we'll have to see what they say about that on the 24th.

I know Reddit is not always a reliable source of information, but there are some quotes from Microsoft execs in here:
https://www.reddit.com/r/windows/comments/k76r5e/windows_11_release_date/


I work here