Microsoft has been working hard on Windows 8 and is now putting all that hard work into a video series. Microsoft is kicking off a "Building Windows 8" series of videos and has posted the first one up on Youtube. You can view the video below that takes you through the thoughts and processes used when designing and building Windows 8.
The video below shows off the tablet interface but unfortunately it appears the embedding has been disabled. You can view this video by visiting this link. The video shows many new features of the interface that Microsoft has built around its new UI.