Does that have to wait for RTM?

From other sites, if anyone's interested, [Alt]+[F4] closes Metro apps, you can put a shortcut to the desktop into your Startup folder so that the Desktop displays on screen at the end of the login process, and it's possible to add the Start Menu folder as a taskbar menu (like Quick Launch in older versions). IOW, it's possible to use Windows 8 with little or no interaction with Metro.