"Microsoft has simplified the upgrade process for Windows 8 dramatically, at least for early adopters, starting with its decision to sell only two retail editions.
Between now and February 1, 2013, Microsoft is offering upgrades to Windows 8 Pro, the full-featured edition whose Windows 7 equivalent typically costs $200. (Upgrades to the less expensive base version of Windows 8 are not available at all right now, and won’t be available until these initial promotional offers are over.)
That makes for some smoking deals. But there are still a few gotchas to be had in the process. And one inexplicable pricing decision actually penalizes customers who are among the first to purchase PCs preloaded with Windows 8."