I first saw the concept camaros at the GM Carlisle Pa tent in 2007. Take a look at the photo on page 63 (lower right corner). It's the concept in it true form WITHOUT the "B pillar", being driven by Rick Wagoner.
It's the only photo I've ever seen of a 5th gen with all the side windows down.... probably for a good reason.
So much style/beauty was lost when they added that center post making our cars coupes instead of true hardtops imo.... Another reason to buy the book.