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Microsoft has begun to rollout Build 14393.82 for Windows Insiders in the Release Preview ring. On PC, the latest update is KB3176932. This is a cumulative update so, while the release notes haven’t been published yet, it’s safe to say that it contains mostly bug fixes and small improvements instead of launching any major new features.
It’s important to emphasise that this update is for those special Windows 10 and Windows 10 Mobile users who have been enrolled in the Windows Insiders program. This program consists of volunteers who offer to run preview builds of the Windows 10 and Windows 10 Mobile operating systems on their own devices. Microsoft uses these users as a way to test the stability and security of special features and functions before rolling them out to the general population.
source:winbeta