Windows 7 Release to Manufacture available to the TechNet and MSDN subscribers.
Windows Communication manager, Brandon LeBlanc, wrote on the Official Windows Team Blog about the Windows 7 RTM availability.

He also reminded that today Volume License customers with an existing Software Assurance license would be able to download Windows 7 RTM in English and in a few weeks the remaining languages would be available to the subscribers for download.

For more information you can refer to the table on top, which was posted recently by Microsoft. Available for download