https://wccftech.com/mega-windows-10-2020-build-introduces-two-new-features/

Microsoft has released a brand new Windows 10 20H1 Preview Build to Windows Insiders in the Fast ring. The Windows maker said that Insiders will see a cumulative update (Build 18970.1005 – KB4518974) because it is testing the “ability to service a build at the same time it is released.” Basically, after installing these latest updates, you should be on Build 18970.1005.

As for the build itself, Windows 10 2020 Insider Preview Build 18970 brings some big changes, including a new tablet experience for convertible devices and the highly awaited Cloud Download reset option.