Wow.
Designers' notes as a standalone, $20 publication...
Even Games Workshop (frequently bashed by their own fans for being mercenary) tends to put this stuff on its website for free, or at worst include it as a page or two at the end of the book.
Everything described in the review could be posted as designers' blog entries (in fact, from the review, some bits
were), interviews in magazines/webzines, explained on forums and released at conventions.
Hell, even after just seeing the review, I'm comfortable I've got the basics of the relevant setting-changes.
I honestly don't see the point in this book.