The future of Windows Mobile
The best way I can describe the new interface is a cross between Windows Mobile and Windows Media Center. Rather than tapping on the screen or clicking on buttons to go through a series of full menus for each program, you can choose programs by scrolling.
You can zip through your email, contacts, appointments, and music programs very fluidly. As the application comes into focus, you can flip between submenus, all from your devices main menu. I'm going to assume you can then open programs in full screen mode in order to do things that take up more screen real estate, like checking your email. No word on how long we'll have to wait to see this new interface in the Western hemisphere.
In order to get the full effect, check out the video on Engadget.