Hi Pieter Germishuys,
The Metro theme is included in our package - simply use the StyleManager. In case you are interested in the XAML reference files that we ship with our installation package, I would like to inform you that those files are still not available. Most probably we will ship them with the upcoming service pack for Q2.
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!