As you one can predict, there is no information available on Windows 8 including GUI till date. But Windows lovers have already started reaming of Windows 8. A deviantart user has come up with a Windows 8 transformation pack that helps you turn around Windows Vista into Windows 8.
You will find nice Windows 8 wallpapers and Windows 8 logon screen background in this pack.
Included In Download
System Tray icon, Tclock Lite & Watermark