Windows 8 Editions: 9 Flavors To Choose From

Windows 8 is going to be 'one OS' to rule all the platforms. But Windows registry shows that the OS will ship in 9 different flavors :-

• Windows 8 Starter
• Windows 8 Home Basic
• Windows 8 Home Premium
• Windows 8 Professional
• Windows 8 Professional Plus
• Windows 8 Enterprise
• Windows 8 Enterprise Eval
• Windows 8 Ultimate
• Windows 8 ARM edition

Does anyone know what features differentiate these editions?