The pre-release Windows 8.1 Spring 2014 update is already floating around the internet and in the hands of those who are lucky enough to have it. The build string is reportedly 6.3.9600.16581.WINBLUES14_GDR_LEAN.13122 2-2030.
Not much else is known in terms of new features but it is being said that the update will be released to the public around the time of the BUILD conference. This is the third source to identify this timeline which means it’s likely going to happen.
Microsoft pre-release build Windows 8.1 2014 Update LEAK January 15th
According to the leak, Update 1 will be...
Free. Windows 8.1 Update 1 will of course be a free update and will be made available to anyone with Windows 8.1 (including those using Windows RT 8.1) via Windows Update, and not via Windows Store as was the case with Windows 8.1.