WinFS isn’t dead? So why upgrade to Longhorn?

Contrary to previous reports that Microsoft was pulling WinFS, their new successor to NTFS, now reports are that Microsoft is going to release WinFS to developers and customers. They are also back-porting the technology to WinXP and Windows Server 2003, which is one of the few reasons Microsoft customers were excited to upgrade to Longhorn.
So the question is, what is there in Longhorn that will compel Microsoft junkies to upgrade?
Lockergnome < MicrosoftWatch