The Star Wars saga is broken up into various distinct time periods. You've got the Old Republic. You've got the Empire. You've got the New Republic. And so forth and so on. The transition between those times is one filled with conflict. In going from the Old Republic to the Empire, you have the Clone Wars. That's where the Rise of the Separatists sourcebook will take place for the Star Wars RPG, coming soon from Fantasy Flight.
From the website:
For generations, the Jedi Knights have been guardians of peace and justice in the Republic. But now they face a challenge like never before. With the Battle of Geonosis, the Clone Wars have begun. Battles rage across the galaxy as the Jedi and the Grand Army of the Republic fight back against the sinister agents and indefatigable droid armies of the Confederacy of Independent Systems. Meanwhile, the diplomats and representatives of the Galactic Senate work for peace and forge political alliances. Amid the chaos, looters, salvagers, and other fringers profit from the detritus of war, or simply try to survive.
Fantasy Flight Games is proud to announce Rise of the Separatists, a new Era Sourcebook for the Star Wars™ Roleplaying Game!
Rise of the Separatists explores the early days of the Clone Wars, and is fully compatible with every Star Wars Roleplaying Game line, including Edge of the Empire, Age of Rebellion, and Force and Destiny!
Within this 144-page sourcebook, you’ll find expanded player character options, new weapons, gear, and vehicles, profiles of famous Clone Wars-era characters, guidance for running a campaign in this time period, and more!