This expansion pack added the Wookiee planet of Kashyyyk and its corresponding space sector. Kashyyyk is different from the previous ten planets: rather than being 16 square kilometers of openly navigable area, it is divided into a small central area with several instanced "dungeon" areas. A new space zone was also added. Other content added in this expansion included the ability to add cybernetic limbs to a player character, quests for three new creature mounts and two new starships. A substantial portion of the content for this expansion was adapted from the film Star Wars: Episode III Revenge of the Sith, which was released to theaters at approximately the same time as the expansion release.
Rage of the Wookiees is also available in the Star Wars Galaxies: The Total Experience and Star Wars Galaxies: The Complete Online Adventures compilation packs.