We recently learned that Doom will launch on May 13th of this year and it seems like Bethesda has more Doom goodies in the works even after the release of the game.
Dark Horse and Bethesda have announced that "The Art of Doom" will be available on June 8th. This isn't going to be some small six page pamphlet either. This thing will be a massive book that features tons of unseen sketches and concept art from the game and will also include an exclusive look at the development of the demons, weapons and the Doom marine. The book will also feature commentary from the developers of id Software.
There will also be a limited edition of the art book available only from the Bethesda Store. Here is the official information from the Bethesda website.