"As always, current Windows Volume License customers, MSDN subscribers and TechNet subscribers will get first customer access, getting Windows 7 on August 6 (MSDN/TechNet) and August 7 (VL), and Windows Server 2008 R2 the second half of August."
Source: http://community.winsupersite.com/blogs/paul/archive/2009/07/22/microsoft-announces-rtm-for-windows-7-and-server-2008-r2.aspx