Hello,
IMO, Microsoft has completed testing and no more processors would be added in the list of compatible processors.
However, still you would be able to upgrade manually as long as the security requirements are met such as Secure boot, UEFI, and TPM. You would not get Windows 11 through Windows update on an incompatible processor.
Check this post as well: https://blogs.windows.com/windows-insider/2021/08/27/update-on-windows-11-minimum-system-requirements-and-the-pc-health-check-app/
Regards.