Microsoft has released Windows 8 videos to its Channel9, some of the videos:
Improving the Setup experience video discusses how to setup Windows 8 through a USB key.
Building robust USB 3.0 support: USB 3.0 is even better than ever! Learn how USB 3.0 speed compares to USB 2.0.
Improving file management basics: File management is a key feature for any experienced user. Learn how Windows 8 can make file management better than ever!
Live tile notifications, Sept 10-14, 2011: Using Live Tiles changes the way that people receive information.
Designing search for the Start screen: The Windows 8 Start search is the most efficient way to find and launch your apps, settings, and files.
Optimizing for both landscape and portrait: The Windows 8 rotation experience from landscape to portrait is fast and fluid. Each application can tailor the view to what makes the most sense for portrait.
Signing in to Windows 8 with a Windows Live ID: This video showcases how Windows 8 will allow a user's settings to persist from one computer to another by logging in using your Windows Live ID.
Fast Boot is even faster than you ever imagined. What this video to find out how fast!
Improvements in Windows Explorer: Windows Explorer in Windows 8 has many great new features.
Accessing Data in ISO and VHD files: Learn how to access data in ISO and VHD files.
Hyper-V: This video shows how using Hyper-V is easy.