I saw this at my University bookstore today and purchased it; obviously, the cover stood out. It details Blatty’s problems with the film companies while directing The Exorcist III and so on, and goes as far to mention (it was published late 2007) that he has been given the opportunity to go into the vaults to try and uncover the lost material (possibly sourced from postings made on CH.com or TNC.com!)
Here is the cover, and an image inside that looks somewhat rare to me:

