Just two days ago the Windows team rolled out Windows 10 Mobile Insider build 10586.338 to the Release Preview Ring. Today, as reported by our friends over at Windows Central, the Windows Insiders in PC Release Preview Ring are now getting the same build.
This build for PC Release Preview Ring insiders is a preview of the next cumulative update for Windows 10 version 1511. In all likelihood, this release might also just kill off the usual bugs before the official build is released to the general public and regular Windows 10 users.
In you're not an Insider that has access to this and the other builds, you can check out our Windows 10 news hub for all the latest news and information on the latest Windows 10 builds. While you're connected, you can also open up a new tab and sign up to become a Windows Insider by visiting this webpage and signing in with your Microsoft account.