Microsoft has released Windows 10 Insider Preview Build 19536 to Insiders in the Fast ring as part of the Active Development Branch. The new build adds automatic optional driver updates and an updated Korean Input Method Editor. The Fast ring will receive builds directly from this active development branch and new features will show up in these builds first. Microsoft started improving the optional updates experience in Windows 10 in September by moving them on a new Settings page available under Settings > Update & Security > Windows Update > View optional updates. Some Insiders will also be able to set up devices to be used by more than one family member when selecting “People in my family”” option.”
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-build-19536-out-for-insiders-with-optional-drivers/