Who should appear in Star Wars: The Clone Wars episodes 88 and 100?

Episodes 22, 44 and 66 featured Cad Bane, Boba Fett and Chewbacca, respectively, since they were Season Finales. I wonder who will be featured in the finale of the upcoming fourth season and the final episode? I mean 66 episodes aired so far, and there are 34 more to make a whole 100 episodes. Am I right?