Yes, well sort of. Star Wars: Darth Maul - Son of Dathomir is considered fully canon. It explains the events running through the end of the Clone Wars, but there is nothing yet describing what happens after the Clone Wars.
Son of Dathomir is an adaptation of unproduced scripts from Star Wars: The Clone Wars, which would have been part of the television show's sixth season had the series not been cancelled in 2013. Although thirteen episodes from the sixth season were released as "The Lost Missions" on March 7, 2014, the episodes that Son of Dathomir were based on were not completed and therefore not released as actual episodes. The story is part of The Clone Wars Legacy line.
They provide a general synopsis:
The series is set during the Clone Wars, and is a continuation of Darth Maul's story from the show. The rogue Sith Lord, who was revealed to have survived the events of Star Wars: Episode I The Phantom Menace in the episode "Witches of the Mist," has been captured by his former master, Darth Sidious, following the events of the episode "The Lawless." Sidious uses Maul in an attempt to draw Mother Talzin, Maul's mother and the leader of the Nightsisters, out of hiding so she can be destroyed, as Sidious considers her a potential threat to the eventual Sith domination of the galaxy. Maul confronts the Confederacy of Independent Systems and captures Count Dooku and General Grievous in pursuit of vengeance against his old master, while the Galactic Republic and Jedi Order become involved in the hopes that they can defeat Maul, Dooku, and Grievous—and, in doing so, end the Clone Wars.