I'm thinking in the near future with the success of Jedi: Fallen Order, The Mandalorian, The Book of Boba Fett and the new Battle Forces we could see Nightsisters and Tusken Raiders show up. They could have ranged units, melee, heavy units and support. They could also be on different sides as well and be versatile. I honestly think they have more to offer than Ewoks (don't get me wrong Ewoks would be cool; but think about a corp of Nightsister Zombies or Tuskin Massiffs Handlers). Nightsisters could have Rancor heavy units. Tusken's could have a Ballista or Bantha. That would also introduce operatives like Assajj or Mother Talzin or Rescued Boba Fett. I would love to have a Maul / Nightsister army with Savage and Assajj backed by a mounted Rancor go against a Clone army.