My copy is still being shipped, so I have not looked at the book in detail. From what I have heard / read, the "outside-in / stakeholder" theme merges Agile methods (stakeholder = "Agile customer") and user experience methods (stakeholder = "end user"). "Consumability" and "Outside-in design" are key parts of the IBM Software strategy. (Consumability: making products easier to install, configure, deploy and maintain.)
To learn more about the book, you can see previews on Safari and read Carl's blog Outside-in Thinking [URL update on Nov-16-2007]. And of course, Amazon.com's entry for the book (where I managed to buy a "used" copy that is new but very inexpensive, not sure how that works).