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As far as I can tell WinPE can only be used to perform a clean install using a WIM image. However, I can't seem to find any definite information that says I can't perform a upgrade installation. Can anyone confirm or deny this?
Also, if it is not possible to perform an upgrade, what is the best option for upgrading many computers with out messing around with install disks?
You could use the User State Migration Tool to "fence off" the user data, use a wim to do a non destructive image, and move the user data back. That's the real beauty of MDT, no need to copy user data off the machines to image. Use USMT hardlinks to keep the data on the local disk. – MDT Guy – 2013-04-03T14:22:01.993