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But to say MS completely reworked UAC is preposterous. 

and yet they have. you've still got time to download the Windows 7 RC and see for yourself.
I know they have since A: I've done research and B: I'm RUNNING WINDOWS 7.

http://blogs.msdn.com/e7/archive/2008/10/08/user-account-control.aspx
http://blogs.msdn.com/e7/archive/2009/02/05/uac-feedback-and-follow-up.aspx

read those and you see the changes they've made to the UAC in 7.