Windows 8.1 build 9600.16606

On 2014-01-30, WZor.Net released an article that described this build. It is supposed to be a pre-release build of "Windows 8.1 2014 Update". 10 screenshots were published in the article.

On 2014-01-31, PainteR posted two screenshots of this build PCPortal, including a small commentary.

On 2014-02-02, WZor.Net released another article with four screenshots of the Single Language SKU.

Some enhancements visible from screenshots and mentioned in the article:
 * Metro apps have a title bar, with close/minimize buttons and the ability to "Split left/right" when you right-click it
 * Windows boots directly to desktop by default on devices without a multitouch screen
 * You can keep taskbar visible while using modern apps
 * Control Panel item in metro PC Settings
 * SkyDrive renamed to OneDrive (in PC Settings, start screen and everywhere else)
 * 200% and 250% DPI scaling modes added to control panel (in 8.1 RTM, to get these values you have to go "custom"), 250% is the default on screens with more than 1800 vertical lines
 * Shutdown button on the start screen*, doesn't show on less than 8" tablets to prevent accidental shutdown
 * Search button on the start screen*
 * Instead of metro bars (top and bottom) a context menu appears when you right-click an app on the start screen*
 * Pinning metro apps to desktop taskbar*
 * * (introduced in 9600.16596)