Some more information is slowly coming out on this book, as people investigate it.
First, it is more of a directory than a coffee table book; what you get if you contribute, is a small one column photo and a paragraph or two. It is normal page size format (near to A4 for you global folk), and set in two columns: it appears as if the maximum size allowed per entry is about 1/3 of a column, or 1/6 of a page. That allows about a wallet size photo, and a couple of brief paragraphs beyond your name, city, and car(s).
There is some conflicting and unsubstantiated information that this is an "opt-out" program, something that if true, I find hard to believe. They are not going to get anything from me, but would they fill this book with a large number of names, cities, and car listings, interspersed with the contributors who opt for purchase and contributing their 1/6 page? I just don't know.
I saw a sample page and it appears as if they'll have to re-design it to bring graphic utilization of the MBCA trademark into allowed compliance.