Windows 8, the next version of Microsoft Windows operating system, builds are leaked on the web and few early enthusiasts got hands on them. These builds are intended to be available only with Microsoft testers who work hard to find issues and report them back to Microsoft.
Geeks at winfuture.de installed Windows 8 and released a walkthrough video of boot up, logon and few customization options like profile image, language, etc. Check the embedded video to have glimpse at Windows 8 UI.
Related: Screenshot Of Windows 8 Welcome Screen