Rogue One: A Star Wars Story (novelization)

Rogue One: A Star Wars Story is the novelization of the film. It was released by Del Rey in eBook format on December 16, 2016, the same date as the film itself. A hardcover version is slated for release on December 20, 2016.

Publisher's summary
The official novelization of the upcoming film Rogue One: A Star Wars Story, starring a band of rebels on a daring mission to steal the Death Star plans.