Microsoft announced the release of Windows 10 Insider Preview Build 21301 from the RS_PRERELEASE branch. The build is now rolling out to Windows Insiders in the Dev Channel. With the latest Windows 10 build, Microsoft adds some refinements to the touch keyboard design and some other improvements.
If you are a Windows Insider, in the Dev Channel, can grab the build through Windows Update. If you are not on the Insiders Dev channel yet, can sign up via the Windows Insider Program settings tab.