The short version is that PowerPivot and the equally cool PowerView is only available in Excel 2013 as part of the Office Professional Plus version, NOT Office Professional. Apparently "Plus" is short for PowerPivot and PowerView. I'm resisting suggesting that it's an acronym for Please Let Us Screw you. Ok, I'm not resisting much.
The long version is...well...read Rob's post.
I'll be Microsoft's MVP Summit when this post goes up. Expect that this will be a topic of discussion.

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