The latest issue of Star Wars Insider (#129) has revealed the next seven episodes of The Clone Wars Season 4. These episodes are:
Episode 7: Darkness on Umbara - "Anakin relinquishes the command of the 501st as the Legion embarks on a deadly mission. Look out for: Jedi Master Pong Krell, the new commander of the 501st!" Episode 8: The General Episode 9: Plan of Dissent Episode 10: Carnage of Krall Episode 11: Kidnapped Episode 12: Slaves of the Republic Episode 13: Escape from Kadavo