There is never enough time in the day but I have managed to get on with it and found an article on how to upgrade Hyper-V.
The steps are pretty short, the only bad point is that you have to recreate all you VM so make sure Screen capture or jot them down.
Hyper-V kicks ass is working better than it did. Linux VM’s are much more stable.
I had one issue which was my Debian VM’s lost there NIC. I will dig out the fix and post another article.
Hyper-V Upgrade – Read More Below
John Howard : Hyper-V RC0 Release is available for download