While many were anticipating the release of Windows 10 RTM this week.
Microsoft instead released a new build 10166 to Windows Insiders.
The build doesn't have any new features as expected, instead focuses on polishing the OS and improving performance.
A new Microsoft WiFi app is introduced in this build, it allows you to purchase WiFi from the Windows Store, this is currently being tested in Seattle, WA and will eventually roll out to the rest of the country (US)
Also, in this build, the Microsoft Edge gets improved on a lot.
You can read more about this build from the official Windows Blog
In other news, according to Microsoft insider @WZorNet who tweeted the schedule for when we will get various RTM releases. It looks like we wouldn't get the final version until 5 days before public release. Though, we will get subsequent RTM builds before that date...