A final version of Windows 8.1 Update 1 has leaked through Microsoft’s official update servers. 

windows 8.1 start screen power button 640x353 Windows 8.1 Update 1 leaks through official Microsoft update servers

A registry hack made it possible to access Windows 8.1 Update 1 directly through Windows Update, and while Microsoft has plugged the leak, the update files are now available online and can be used for a manual install.

Windows 8.1 Update 1 is focused at improving the experience for keyboard and mouse users. Changes include a power and search button in the Start screen for non-touch devices, ability to minimize, maximize and close Modern apps, right-click context menu for Live Tiles, automatic skipping to the desktop interface for desktop users, preview of active Modern apps in the taskbar, and more. Update 1 will also decrease the memory requirements for the OS, a move Microsoft hopes will help it run better on low-end hardware with limited storage space.

The leaked update is not confirmed to be the RTM (final) version, though given the fact that it’s secretly available on Microsoft’s update servers, it’s likely free of any noticeable issues. The official rollout is expected to begin on April 8, so it would be a good idea to wait it out instead of updating via the leaked files, lest it brick currently stable Windows 8.1 installations.

Source: My Digital Life Forums