I do hope Anduin comes back in Dragonflight, mainly so he can interact with Wrathion. And no, not because I am shipping them. I just think they have great chemistry and also that Wrathion will need advice during Dragonflight and Anduin is one of the people he could trust to give him honest advice.
I think that we may see the Dragonflights making a decision to not create any new Aspects (democratize their power) but rather disperse the gift of the Titans among the entire flights. We have two flights with no proper Aspect and let's face it, I think Nozdormu is not likely to survive this xpac.
From what I've seen (haven't had a chance to do it yet) the Lordaeron questline is solid. As most fans here seemed to agree, we are getting the Desolate Council back and we are getting Belmont and Faranell on it. Calia is just one among them, Voss had a satisfying arc in BfA so that her getting a place there makes sense (even though how that arc started still makes little sense). Velonara is there to give the Dark Ranger concept a continuation (and her split with Sylvanas helps).