Story at The Register

Heres the first paragraph:

Microsoft has pushed back the consumer release of Windows Vista to January 2007, because it isn't good enough to meet its Q4 2006 target.Instead, Microsoft has staggered the launch into two parts - subscribers to Microsoft's Volume Licensing Program will be able to get the code in November 2006, while OEMs can begin shipping it in January next year. [cont.]
My main question is, Whats gonna be the main difference in the two releases? Whats the OEM version getting that the volume licence isn't?