With the work-in-progress When We Were Beautiful documentary premiering at the Tribeca Film Festival at the end of the month, the accompanying book seems to be now available for pre-order on Amazon. There's still no cover and few details but the release date is listed as October 27, 2009 and it's 208 pages long.
Also on Amazon is the Bon Jovi Encyclopedia by Neil Daniels. I have read about it before but have yet to part with my money (Besides, I'm a student; I can't go around splurging on everything that tickles my fancy, if I want to eat occasionally :P). The product description claims to include "entries on every recording and bootleg" which is a pretty big statement but I'll be keen to have a look through at some stage.