Jason's working on "Pirates of the Caribbean: From the Magic Kingdom to the Movies" now, and there will also be a second Pirates book in 2007.
The first one (the cover is posted at KeepToTheCode.com) will be in 3 sections from what he tells us:
1) Designing the original Disneyland ride, including abandoned concepts and some concept art that's never been published before;
2) The ride itself, and
3) Transitioning the ride into the film.
The second one is "Pirates of the Caribbean: Making the Movie Trilogy" (working title). It should be out in spring 07.