Microsoft accidentally releases Windows 10 build, users recommended not to Install

Since there is a lot of time when a Windows Insider build was released, users around the world were expecting a build lately this week. As Microsoft is changing deployment of some engineering systems that pushes builds, the software accidentally released builds for both PC and mobile that were still unstable for general users. The build number is 16212 that is comes from RS_EDGE_CASE branch.
The Insider team was though quick deploying barriers that prevented the further leak, but those who got it installed should go back to stable build, says Microsoft.

#WindowsInsiders, thank you for your patience as wen debugged our #flight problem today and reached a resolution: https://t.co/VkLWLIWEST.

— Dona Sarkar (@donasarkar) June 2, 2017

A blog post was also posted by Dona Sarkar, head of the Insider program giving further details and possible resolution. You can read that here. For PCs, the article says:

Please be aware that this build was never intended to go out to Windows Insiders and may include issues that impact usability of your PC – more so than the normal builds we give you. You can either sit tight and wait for us to publish a newer build to you or you can roll-back to the previous build via Settings > Update & security > Recovery. And check your Windows Insider Program settings.
NOTE: You have up to 10 days to roll-back and this will only work if you did not do Disk Cleanup to remove your previous Windows installation.

Non Insiders may have also seen the unintentional build, but this should not install on such devices. Dona also indicated that there would be no new builds this week.