yes you can get a Retail Version of Windows 7 permitting that you have purchased the corresponding Windows Vista retail box after june 26, 2009. I have ordered a retail Windows 7 Home Premium because i had the Vista Home Premium retail version. Just send microsoft the sales receipt of windows Vista to a Buffalo address i think and hopefully when the Windows 7 releases, you ll get your boxed retail windows 7.
PS: it all on microsoft's website under the OEM upgrades. try to find the link where its says Retail Upgrade.