Windows 8 : Three Editions

@ 2012/04/17
Microsoft Communications Manager Brandon LeBlanc has finally given us our first official information about product editions for Windows 8, which is now confirmed to be the product's actual shipping name. For 32-bit and 64-bit PCs, there will be two editions of the operating system that most people will see: Windows 8, which is roughly equivalent to Windows 7 Home Premium, and Windows 8 Pro, which is analogous to Windows 7 Ultimate. Windows on ARM, now called Windows RT, is a standalone product with roughly the same feature set as the standard Windows 8 product.

Comment from jmke @ 2012/04/17
A nice table comparing features here:

http://windowsteamblog.com/windows/b...-editions.aspx