Maul-There are EU comics about a clone, and a non canon comic, which the TCW Maul is based on, so it could serve as a follow up. They really should have followed the Shadow Conspiracy's end, simply let Sidious kill him. Talzin-We don't even know her true intention, maybe some comics to tell her end like Durge? Mandalore-Maybe just connect with Spar? Bo-Katan is a waste.