From a news report at Infoworld:
"Specifically designated PCs that are pre-installed with Windows Vista Home Premium, Windows Vista Business, or Windows Vista Ultimate may qualify for an upgrade to the equivalent Windows 7 product," a Microsoft representative said. Similarly, in some markets, retail-packaged Windows Vista software products (sold separately from PCs) may also qualify for an upgrade to the equivalent Windows 7 product.
Manufacturers, or OEMS, and retailers may charge a nominal stocking or shipping fee pertaining to the arrangement.
"Negotiate with Microsoft. "Everything's negotiable, but if you don't ask, you don't get.
"Estimated retail prices fore the full packaged Windows 7 product in the United States range from $199.99 for the Premium edition to $319.99 for the Ultimate variant. Upgrade pricing for Windows 7 ranges from $119.99 for the Home Premium edition to $219.99 for the Ultimate product.
From the Microsoft Site, it looks like 64 bit is included:
Participating retailers Country: United States
Costco.comBest BuyAmazon.comOffice DepotTigerDirect.comMicrosoft Storenewegg.comSamsclub.comFry's ElectronicsOfficeMaxWalmart.comQuill
System requirements
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1GHz or faster 32-bit (x86) or 64-bit (x64) processor
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1GB RAM (32-bit) / 2GB RAM (64-bit)
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16GB available disk space (32-bit) / 20GB (64-bit)
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DirectX 9 graphics processor with WDDM 1.0 or higher driver
Windows 7 Upgrade Advisor can help you determine which features and editions of Windows 7 will run on your computer; visit the Windows 7 Upgrade Advisor page.