According to LucasArts, the game features an exclusive DS story which expands the Clone Wars series. It also enables you to create your own personalised Jedi teams by pairing up Jedi Masters and Padawans. So Anakin Skywalker is able to fight alongside Obi-Wan Kenobi and Ahsoka Tano wth Mace Windu.
It's also possible to develop the relationship between your two Jedis and develop more powerful attacks and special abilities. Missions can be replayed with different character combinations for an entirely new experience, as well as the chance to unlock new areas, collectibles and other secrets.