Latest Word on the Lord of the Rings Film Novelization - Diamond Previews clears up the confusion
Previews catalog often works far in advance of normal solicitation cycles. As a result, the information provided on the June 1st release indicated a novelization. Tolkien's estate however does not wish to release a trimmed version of the original at this time. As a result the book released will feature cover art based on images from the movie to tie into the release, but the interior text will be that of the Fellowship of the Ring, as written by Tolkien. We apologize for any confusion caused by this.
Our thanks to Barry at Diamond Comics!