https://www.bleepingcomputer.com/news/microsoft/windows-10-build-19536-out-for-insiders-with-optional-drivers/

Microsoft has released Windows 10 Insider Preview Build 19536 to Insiders in the Fast ring as part of the Active Development Branch that reflects the latest work in progress code and adds automatic optional driver updates.

"Moving forward, the Fast ring will receive builds directly from this active development branch and new features will show up in these builds first," Windows Insider Senior Program Manager Brandon LeBlanc says.