Microsoft has just released a fully configured VHD (Windows 2008 R2 with v.Next installed) ready to download from http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=1b23c540-9b9f-4d41-a05d-d4b216061957&utm_source=feedburner&utm_medium=twitter&utm_campaign=Feed:+MicrosoftDownloadCenter+(Microsoft+Download+Center)