Notice how Microsoft has planned a event on 6/24/21 at exactly 11 AM EST.

Then they also uploaded a video of older Windows startup sounds slowed down. Notice how the video is EXACTLY 11 minutes long.

I have reason to believe that Microsoft lied about Windows 10 being the last version of Windows. Don't believe the screenshots? Have a look:

https://docs.microsoft.com/en-us/lifecycle/products/windows-10-home-and-pro

https://www.microsoft.com/en-us/windows/event

https://youtu.be/fMr4Qm5ZWrI

One last thing: The code name that I see floating around for this version is called "Sun Valley". And Microsoft doesn't create events for major updates to Windows. They only create big events for new Windows Releases.