Seen on Technet - Windows 7 Professional, VL Build

For anyone with a Technet subscription, I noticed today that Microsoft has posted a couple new items in the Windows 7 section. These are the 32 and 64 bit ISO files for Windows 7 Professional, VL Build. I'm curious though, as to whether anyone knows what these actually are. I thought at first that perhaps they were Volume License versions, but then figured I wouldn't have access to them if they were, but also that the Enterprise edition was the only volume licensed version offered. Or not? Does anyone else know what this build is for and/or what the difference is between it and the standard Windows 7 ISO's also offered via Technet?

Any help towards ending my confusion over this would be greatly appreciated.

Thanks,
TP