Visual Studio 2012 RC was released about two weeks ago:
Visual Studio 2012 RC splash screen
Tab colors were changed, most noticeable are the blue color for the selected tab the purple color for the preview tab. Tabs Studio style was updated to reflect these changes:
Selected tab in Visual Studio 2012 RC
For those working with tab groups, in VS 2012 Tabs Studio now supports the Float all command to float a whole tab group out of the main window and the Move all to next/previous tab group commands:
New tab context menu commands in Visual Studio 2012
Floating tab group in Visual Studio 2012
Download link: Tabs Studio v2.8.0.
Tabs Studio Blog (organizing Visual Studio document tabs) 