A newer build of Windows 8.1 Update 1 has supposedly made it's way to notorious Russian leaker WZor



From Neowin:

As you can see, this may also be the first leak to appear online for the update. WZor had previously predicted that a leak would happen on or by 15 January.

The spring update will likely not bring a significant overhaul to the platform by any means and we will have to wait until April of 2015 to see any major changes to the platform when Windows 9 arrives.

There's not much else to go on other than the screenshot that made it's way online over a week ago, but with an expected official release around the time of the BUILD conference, we don’t have to wait too long to see what the update includes.

  Details of newer Windows 8.1 Update 1 build; full ISO may (still) leak soon