Just in from Microsoft:
Given the upcoming PC buying season with graduation and then on to back to school, there is a new offer coming to market for consumers to allow them to easily get the version of Windows that works best for them on their new PC. Beginning April 4, 2010 at participating retailers, people who buy a new PC will have an opportunity to add Windows Anytime Upgrade to their purchase at a special low price.
In the US, the prices are as follows:
Windows 7 Starter to Windows 7 Home Premium $49.99 (versus everyday price of $79.99)
Windows 7 Home Premium to Windows 7 Professional $79.99 (versus everyday price of $89.99)
This offer will be available at the Microsoft Store and participating retailers and for a limited time only. (In the US this offer ends July 3.)
Details vary by retailer and geography, so check with your local retailers to see which PCs they are offering. Retailers in over 20 countries will participate in this offer.
Participating retailers also choose which Windows Anytime Upgrade path to offer. Some may offer Windows Anytime Upgrade for going from Windows 7 Starter to Windows 7 Home Premium, while others may offer Windows Anytime Upgrade for going from Windows 7 Home Premium to Windows 7 Professional. Others may offer both.
You can learn more on the Windows Team Blog.