neowin[.]net/news/microsoft-shares-more-details-about-the-windows-10-21h2-feature-update/
blogs.windows[.]com/windowsexperience/2021/07/15/introducing-the-next-feature-update-to-windows-10-21h2/
My Win10 VMs aren't hardware compatible to install the Insider builds of Win11, at least for now, so my Win10 64-bit Insider VM was demoted to the Preview Channel, where it just got the 1st release of what's going to be Win10 21H2, coming this fall. The big news is that it's again a cumulative update, just like 21H1. Also like 21H1, you're probably not going to notice anything different. At least one of the 2 yearly Win10 version upgrades used to be a full Windows install -- those days may be over, at least for Win10 going forward.