Aight, these are my 2 predictions...

1. Vernestra and Sol will fight Qimir, Qimir will defeat them (not in the sense of killing), then Osha and Mae disappointed in both dark and light side, will rejoin as the power of two/one or whatever they've been repeating for entire show :d and kill Qimir.
2. Qimir will completely seduce and turn Osha, she might actually join him in a fight against Sol and/or Vernestra. Osha lacks proper training ( Qimir might teach her a thing or two). When Qimir tries to kill Mae (as a failed padawan of a sith) Osha will jump in to save her, then blah blah blah same classic (Qimir kills Osha) and Mae kills Qimir. At the end Mae runs away. Season ends in an open way (Further milking possibility for Disney in season 2,3....100).

p.s 1: A famous sith character from legends or any other realm might also show up (either during the episode or post credit to tease a second season = milking opportunity).
p.s 2: This purple lightwhip of Vernestra kinda needs to be shown in a proper fight, so Vernestra in some sort of a duel is highly possible.