I received an invitation for this beta exam and have scheduled it for next week.
But now i also saw the invitation on the website of Trika i though just let's put a link here so everyone that would like to take the exam is able to.
http://blogs.msdn.com/trika/archive/2008/06/02/register-for-beta-exam-71-652-ts-windows-server-virtualization-configuring.aspx