https://wccftech.com/windows-10-20h1-arrives-for-the-slow-ring-tonight/

As promised, the next Windows 10 feature update is now live for Insiders in the Slow ring. Microsoft has this month released the November 2019 Update for the public, internally finalized Windows 10 20H1 and now released its Preview Builds to the Slow ring. Quite a happening month.

The build arriving today is Windows 10 Insider Preview Build 19025.1051 from the 20H1 branch, which was released on November 15 to the Fast ring. Since then Microsoft has delivered another update to Insiders in the Fast ring.