Dawn of the Rebellion: Star Wars Roleplaying - Rules of Play says:
Dawn of Rebellion is the first sourcebook of its kind, designed to be used alongside any of the three core roleplaying lines. Campaigns using Edge of the Empire, Age of Rebellion, or Force and Destiny - or any combination of the same - will find a wealth of valuable information within its 144 pages. Primarily focusing on the years preceding the Battle of Yavin, Dawn of Rebellion features descriptions, context, and statistics for many of the iconic characters and vehicles appearing in the Star Wars: Rebels television show and in Rogue One: A Star Wars Story. The might of the Empire is at an unprecedented peak and a successful rebellion seems like a fever dream to all but the most optimistic. Even those who have no personal stake in the Galactic Civil War feel the tremendous impact of this new order.