Well this is certainly a first! Those who buy the upcoming novel, Halo: Silentium, will also get access to additional content and XP for Halo 4!
For the additional content, my guess is it'll be armour permutations, as it looks like these will be Forerunner symbol codes to enter at Halo Waypoint again.
You can check out the full details via the official press release from our friends at Tor Books below:
Halo Fans Can Unlock Additional Content and Gain XP with the
Release of HALO: SILENTIUM
Tor and 343 Industries™ to offer bonus material in the latest book in the Halo Forerunner Saga
New York, NY – February 11, 2013 – Tor Books, an imprint of Tom Doherty Associates, LLC – the largest publisher of science fiction in the world – and 343 Industries™ are excited to announce a new initiative to coincide with the release of HALO: SILENTIUM by acclaimed science fiction author Greg Bear.
Leading up to the release of HALO: SILENTIUM (March 19, 2013), Tor and 343 Industries will be sending out encrypted communications via halowaypoint.com bulletins and forums, which will allow Halo fans to unlock additional content. There will also be embedded data in the text of the HALO: SILENTIUM paperback and e-book editions.
These communications will begin now, and continue on halowaypoint.com leading up to the March 19th release of HALO: SILENTIUM.
Tor Books has proudly partnered with Microsoft and 343 Industries to publish every book set in this iconic universe. The Halo franchise is an award-winning collection of properties that have grown into a global entertainment phenomenon. Beginning with the original “Halo: Combat Evolved” for Xbox in 2001, the rich fiction of the franchise has since inspired a series of blockbuster Xbox and Xbox 360 video games, New York Times bestselling novels, comic books, action figures, apparel and more. To date, the Halo franchise has sold more than 50 million copies to date, with franchise sales eclipsing $3 billion over its lifetime. “Halo 4” marks the beginning of a new saga in the iconic franchise, as Master Chief returns to confront his own destiny and an ancient evil that threatens the fate of the entire universe. Developed by 343 Industries exclusively for Xbox 360, “Halo 4” released on Nov. 6, 2012, earning high marks from industry insiders and fans alike.
About Tor Books
Tor Books, an imprint of Tom Doherty Associates, LLC, is a New York-based publisher of hardcover and softcover books. Founded in 1980, Tor annually publishes what is arguably the largest and most diverse line of science fiction and fantasy ever produced by a single English-language publisher. In 2002, Tor launched Starscape, an imprint dedicated to publishing quality science fiction and fantasy for young readers, including books by critically acclaimed and award winning authors such as Cory Doctorow, Orson Scott Card, and David Lubar. Between an extensive hardcover and trade-softcover line, an Orb backlist program, and a stronghold in mass-market paperbacks, books from Tor have won every major award in the SF and fantasy fields, and Tor has been named Best Publisher 24 years in a row in the Locus Poll, the largest consumer poll in SF.