When build 17031 was uploaded to Microsoft's Windows Update servers and people found a way to update through tweaking settings in the registry, Microsoft pulled it. It may have merely been a test.
Hands-on with the Microsoft Surface Book and Surface Pro 4
Review: Tesoro Excalibur Spectrum, a colorful Mechanical keyboard
Hands-on: Lumia 950, 950 XL, 550 and the Continuum Dock
lumia 950 xl
Here's the recap for Microsoft's Windows 10 Devices event in NYC
Editorial: Surface Pro 4 excites but leaves room for improvement
surface pro 4
Microsoft has confirmed that Windows Server 2012 R2 will also be getting a "Spring Update" around the same time as Windows 8.1 but the company has yet to offer any specifics.
Microsoft has now officially announced the update to Windows 8.1 which will arrive in the Spring. The update adds a ton of features for mouse and keyboard users with modern apps.
Screenshots of a reported build of the Windows 8.1 spring update have leaked but they do not show too much, other than a small update to IE11 and of course, the build number.