https://wccftech.com/new-windows-10-19h1-build-18247/

While we await the release of Windows 10 October 2018 Update, Microsoft has long ago moved on to the development process of Windows 10 2019 edition. The company has just started rolling out Windows 10 19H1 Insider Preview Build 18247 to Windows Insiders who had opted in to Skip Ahead. It should be noted that this build isn’t “available for PCs running 64-bit Windows 10 Home and Pro editions in Czech (cs-cz).”

Bringing no new features, here are general changes, improvements, and known issues that are coming to you through today’s Windows 10 19H1 Preview Build.