I just received this announcement. Not only are there links to purchase the software, but also some information on upgrade pricing and date limitations. Take a look!
NEWS: Adobe® Creative Suite® 6 is Now Shipping
All CS6 suites and individual tools are available immediately for Windows and Mac, with delivery via boxed shipment or instant download. Discounted upgrades are offered from earlier versions, including CS3 and CS4 until the end of the year.
One big change: Starting with CS6, upgrades are only available direct from Adobe in most major geographies.
The company has also released all CS6 free trials for download and installation. These trials are fully-functional and will work side-by-side with any previous version(s) of the Creative Suite, including CS5 and CS5.5. We’ve got a complete list of trial direct download links for easy access.
The CS6 Student & Teacher Editions are now shipping as well. These offer up to 80% off the regular prices for education customers including students, teachers, and staff.