UPDATE 11/22: We have released Build 19025.1052 which is a Cumulative Update with no major changes. We are trying out our servicing pipeline on 20H1 builds.
Today we’re releasing Windows 10 Insider Preview Build 19025.1051 (20H1) to Windows Insiders in the Slow ring.
For details on what is included in this build and known issues, see this blog post.
For a summary of all the new 20H1 features, see this article on Microsoft Docs.