The link below has a host of info about the new GUI for WIndows 8, including a new start screen that resembles the Windows Phone 7 interface and its tiles.
http://uk.gizmodo.com/5807615/windows-8-and-its-incredibly-cool-new-touch-interface
At first glance, I am not sure how well this will work in an office / school environment or for non-touch screen based devices as a whole.
Edugeek members also appear to have mixed feelings on the new interface as can be seen on this thread here.
http://www.edugeek.net/forums/windows/76714-windows-8-urgh.html
It is still early days so time will tell .