Hi, well the good news is that work on a new version of the PRS Guitar Book is underway. I did suggest doing it a couple of years ago but my publisher said no! The aim is to publish late in 2014 on the eve of PRS's 30th Anniversary. Unlike previous updates, which just added pages and images to the previous existing txt, the new version will be in a different format - like the recent books on Squier electrics and Ibanez. A lot of the existing book will be condensed then we'll add info on all that's happened since late 2007 - and as you rightly say, there's a lot! We won't be able to include all the photos and spreads in the current book, so that makes it still valid.
I'm hoping too we can supply the book in a digital format - not my decision. I'm also looking into how we can update the information and model key, perhaps via a location on PRS's website, on a regular basis after the publication of the new book.
I'll let you guys know when I get more information on the actual publication date. In the meantime, I'd better fine some time to write it!
Dave