My first reaction to this was, "OMG, a new book from pg! Why didn't I hear about this before"? The comments here cleared up things for me. I think having the word "interview" in big letters somewhere on the cover would be less misleading.

You do explain things somewhat it in the Product Description, but in a very PR way "hold the answers, etc." without mentioning the book is based on the interview. Some people here say that it's just the interview? Can you clarify if it is more than that and if that what have you added?

In addition to the blog post, I think you should have a better description on Amazon.