I know this is an old post, but I wanted to clarify one thing. A WIM file is much more powerful than just being an install media. A WIM file basically holds all of the information for the “C” drive. Case in point, the Kace K2000 (an Enterprise deployment appliance) uses WinPE to deploy WIM images to systems. It allows you to inject software and drivers without having to re-capture the entire drive. This allows for a faster deployment and more options.
I would love to see FOG integrate WIM images for Windows deployment. I would even be willing to donate to a fund to make this happen.