Yeah I guess Hale most likely won't be returning.
Lauren most likely will have some "renegade scientist" plotline for a while(that is if she did not use the fae genes on herself). She's clearly pissed at fae and the whole "betraying Taft" felt more like a parting gift. I would not be surprised on if she took over Taft's corporation, lol, since NO ONE ever would know she betrayed him and she as quite high-ranking there. Also can't wait to find out the whole "Karen" backstory.
Kenzi most likely will get Dyson eventually, although there's the evil druid dude too who will most likely give her evil powers. Frankly it would not surprise me on if at some point we would have Kenzi versus Bo scenario, since Kenzi has become such a, for the lack of better words, Willow. Which I guess is exactly what Norn's gift to her was. the actual goo was just the catalyst of all this shit, since Norn is long-term planner. Especially since Kenzi was so damn proud of being so Human when she entered Norn's place back then. So taking away what makes Kenzi "human", putting her through shit that makes her NOT want to be human is a perfect price for that and Norn yet again for what was desired(Dyson's love) takes what the person loves the most(Kenzi's humanity)
Dyson? no idea. Most likely will save Kenzi eventually(the way I see it, the whole Inari situation was a bit of foreshadowing), also we still have his pack storyline and his best-friend-turned-traitor is most likely still alive.
Trick I am not sure. He is either evil or good, but certainly NOT trust-worthy(Aife did say to "look out" for Trick, which can be interpreted in two different ways, unlike had she used "look out AFTER")
Bo most likely will end up having to take out her father and both light and dark will turn on her.