After nearly nine months of testing in the Fast ring, Microsoft has seeded its first Windows 10 20H1 Insider Preview build to the Slow ring. The build number being offered is 19013.
Build 19013 RSS
Microsoft has released a new ISO for Windows Insiders, and it's build 19013, which was released last week for Insiders in the Fast Ring. There's also a matching build of the Windows 10 SDK.
Microsoft has released a new cumulative update for Insiders in the Fast ring, which is build 19013.1000. The release only serves to test the servicing stack, and it's happening again next week.
Microsoft has released a new build of Windows 10 to Insiders in the Fast ring, and though it doesn't come with many new features, it comes with some improvements and fixes to the OS.
Today, Microsoft released a new Windows 10 Insider Preview build to the Fast ring. Build 19013 includes more kaomoji, and it also includes improvements for the Windows Subsystem for Linux.