Just ran across the boxes they will be using to ship Windows 7 (available Oct. 22, 2009):
From Bink.nu:
Microsoft has now set July 13th for RTM “sign-off”.
Sign off is the process where all divisions sign that they agree on the final code, which means the actual RTM build will be created a few days earlier, which is targeted on July 10th.
The general availability (GA) is set to October 22nd, this is when you can buy it in stores in a box or on new PC’s (OEM).
We can expect the RTM much earlier on MSDN, Technet and Volume Licensing download sites, probably a few days after July 13th.