Windows 8 milestone 2 build 7927 appeared to have hit on the Torrent sites early Monday morning.
Winrumors managed to get a screenshot of the leaked 7927 build and claims that the new build contains unlockable UI elements, new wallpapers and a Betta fish boot screen.
A video has already surfaced on the YouTube of a user demonstrating the features of Windows 8 milestone 2 build 7927 (see embedd below).
Also, it appears Microsoft has leaked the new UI, with a new marketing video for "Flexible Workspace". In the video, the Redmondian's showing two short flashes of a new interface.
The screenshot shows a major overhaul of the taskbar.
The new interface depicts a clock in the middle of the taskbar, surrounded by text.
WithinWindows says that it is in-fact, Rainmeter!