It appears that the general idea people who played Beta got was that Azshara might have a potential involvement down the line in Legion.
Now I have done Aszuna (at lv109 so bear in mind that I haven't gone to Suramar yet), the more I think about it the more I consider that this arc was just a side arc that foreshadows Azshara's involvement in a future expansion, and that like in Cataclysm she won't make any other appearances. Back then, people speculated that Azshara will be involved one way or another after Darkshore and Vashjir, but also nothing happened there.
That and Azsuna made me think that, those far between apperances are only teasers or foreshadowing for something greater to come, especially one line Azshara told Farondis during the final leg of the questing experience there.
So, why are people getting the vibe of further involvement? I really don't feel it, and most likely I have always thought we are giong to get Azshara and her Old God masters as central villains anyway. Anything I am missing or yet to come across?
Thanks.