Neowin posted a story that another build of Windows 8.1 has been leaked
Screenshots of Windows 8.1 build 9379 has leaked which is the fourth copy of Windows 8.1 to have been spotted in the wild, well ahead of Microsoft's expected release in June and closely following behind the leak of build 9374.Windows 8.1 Build 9379 Screenshots
The images you see above are of the build 9374 of Windows 8.1 which will be released later this year. As with any leak, we highly caution you from installing the build on your primary machine as these builds are likely not stable and could corrupt any disk you install the files on.