MSDN has posted some of the new interface changes in Windows Explorer in Windows 8.
Windows Explorer is a foundation of the user experience of the Windows desktop and has undergone several design changes over the years, but has not seen a substantial change in quite some time. Windows 8 is about reimagining Windows, so we took on the challenge to improve the most widely used desktop tool (except maybe for Solitaire) in Windows. Alex Simons on the program management team authored this post with a detailed look at the evolution of Explorer and the major improvements to its interface and functionality for Windows 8.