Microsoft has released a new build of Windows 10 to Windows Insiders, build 10166 is the latest build being offered and includes the latest bug fixes and enhancements. This build also allows Insiders in the Seattle area to try out the new Microsoft Wi-Fi app, which appeared in a build previously. You can download this new build via Windows Update right now.
Just like 10162, this build is all bug fixes and performance improvements. Microsoft is working hard to get Windows 10 finished and out the door to OEMs, so this isn’t too surprising. The update is rolling out now, so if you can’t see it in Windows Update yet, give it some time.Further reading: Microsoft, Windows 10