Here is nice info about Windows 7 RTM and release dates for various types of customers.
The Windows 7 Team blog has posted a great update which describes what happens once Windows 7 hits that all-important milestone, Release to Manufacturing (RTM). See the blog post to read about the nuances of RTM, but here’s the gist of what to expect once it’s attained (still anticipating the latter half of July):
First, TechNet and MSDN subscribers will be offered the final version of Windows 7 to download a few weeks after the RTM announcement. Then, those of you who are volume license customers will be able to get Windows 7 on September 1. And finally, the retail versions of Windows 7 will be in stores October 22, the same time as it becomes available on new PCs. If you preordered Windows 7 through the Microsoft Store, you can expect delivery around October 22.
More info can be found here.