The bits are available now!
And tomorrow, our Volume License (VL) customers with an existing Software Assurance (SA) license will be able to download Windows 7 RTM in English via the Volume License Service Center (VLSC). In a few weeks, the remaining languages will become available to them. If you are a VL customer without a SA license, you will be able to purchase Windows 7 through Volume Licensing on September 1st.
For more information on Windows 7 Availability, please see this blog post. The post has been updated – including a nice chart.