https://wccftech.com/windows-10-20h2-preview-build-19042-662-kb4586853/

Microsoft has released Windows 10 20H2 Build 19042.662 (KB4586853) to the Beta and Release Preview Channels for Insiders who are currently on Windows 10 October 2020 Update. This seems to be the "preview" version of next month's Patch Tuesday updates. Last week, the Windows maker released preview builds for earlier versions of the operating system, including version 1909, version 1903, and version 1809.

For more details, head over to the official blog post.