Ramblings from another nerd on the grid
Virtual Machine Servicing Tool (VMST) 2012 is designed to work with System Center 2012 –Virtual Machine Manager (VMM), System Center 2012 Configuration Manager and Windows Server Update Services (WSUS) 3.0 SP2. VMST 2012 helps you reduce IT costs by making it easier to update your offline virtual machines, templates, and virtual hard disks with the latest operating system and application patches—without introducing vulnerabilities into your IT infrastructure. This Solution Accelerator includes the following components:
Go get it @ http://www.microsoft.com/en-us/download/details.aspx?id=30470.