I also want to see kana's pack/tribe and maybe dominate them like the ninjas or Asteria's people.
Also Morgana's traitor servant I hope we can do something with her since it implies that she can be an ally after you capture her.
Both Maven's tribe and Dhena will reappear in Act Three :)
Thanks for asking the question Ouro100 and for answering it Arc, I wanted to know that too.