Microsoft has delivered Windows 10 Insider Preview Build 18855 to Insiders testing Windows 10 20H1 in Skip Ahead.

“Today we are releasing 20H1 build 18855 to Windows Insiders who have opted into Skip Ahead,” Microsoft’s Dona Sarkar announced. “Remember, these builds are from the 20H1 development branch. Some things we are working on in 20H1 require a longer lead time. We will begin releasing 19H2 bits to Insiders later this spring after we get 19H1 nearly finished and ready; once 19H1 is ‘nearly finished and ready’ we’ll also use the Release Preview ring for previews of drivers and quality updates on 19H1.”

Oh, the contorted language that Microsoft must use since it refuses to use well-understood terms like “release candidate” and “release to manufacturing.” Ah well.

In any event, build 18855 appears to track, feature- and fix-wise, very closely to last week’s Windows 10 Insider Preview build 18353, in that it adds the same several features to Windows Sandbox. We’re obviously just in a holding pattern for now until 19H1 is officially completed. Sorry, “nearly finished and ready.” It will happen eventually.