Microsoft has released a pre-configured VHD of v.Next Beta running on WS08R2. You can download from the link below.
Lab guides are posted on MSConnect. There are eleven labs that correspond with this VHD.
Bugs, DCR’s, general feedback can be submitted through the Microsoft Connect OpenBeta program using the feedback tool.
If you are not a member of the v.Next OpenBeta, here is a quick link to join. http://go.microsoft.com/fwlink/?LinkId=193914