Neowin.net posted a news story that Microsoft is testing ribbon UI in Windows 8
In the mist of the latest Windows 8 welcome screen and Microsoft starting to take action on websites that leak Windows 8 screenshots and features, a new set of screenshots have been revealed by Rafael Rivera and Paul Thurrott.Microsoft testing ribbon UI in Windows 8
The latest screenshots show that Microsoft is looking to expand its ribbon UI from simple applications like Calculator, Paint, and more advanced software applications like Office 2010, comes the ribbon interface being revealed under Explorer.exe shell.