I have been waiting for this book for years. I met the biographer, Bill Patterson, many years ago at a convention in Santa Clara, when he gave an early reading from the book. The first book in the now two-volume tome is finally being released by Tor Books on August 17. Get it from Amazon.
I made this graphic to commemorate the release. I got a high resolution image of the cover from the publisher, then Photoshopped it onto a 3D book image and composited and lit for effect.