"deliver an intuitive and engaging experience to users of tablets and large screens . . . [and] complement core features of the platform that will enable developers to rapidly create rich data visualization and slick interactivity." --Telerik Press Release
This toolset is targeted at HTML and XAML developers who are riding the wave of responsive design for software that looks and feels good across devices. The preview version of the RadControls for Metro preview version will be available to members of the Windows 8 dev club; you can sign up to join and receive the an invitation to the early preview here (http://www.telerik.com/early-windows-8-adopters.aspx).
While you're waiting for that invitation, check out some pretty images: