Microsoft's aim to get a tablet-optimized UI in Windows 8 was supported on Friday by registry key discoveries in a milestone build. Repeated references exist to an "Immersive" shell that would launch on top of Windows. GeekSmack's screenshots also make mentions of a docking system that would couch apps and an "Immersive browser" that would be more than just what's seen today....
Source: Yahoo! News
Source: Yahoo! News