Microsoft has now released a pre-configured VHD for ConfigMgr 2012 Beta 2 which you can download at: Bear in mind that this is 10 GB ish in size (although Microsoft has divided it into chunks), and remember this is a Beta so don’t go installing it in your Production environment. Have Fun…!!!
This download comes as a pre-configured Virtual Hard Disk (VHD). It enables you to evaluate System Center Configuration Manager 2012 Beta 2 on Windows Server 2008 R2.