So, as we now know from 8.3 ptr, Azshara will survive Ny'alotha. Her master and enemy, N'zoth is dead, her kingdom is destroyed. What will she do now? Everyone in Azeroth is occupied mainly with holding back the Scourge that runs all over the planet while main and best forces of Azeroth are in Shadowlands.
Azshara always dreamed to be queen of all Azeroth. But what will she do now? Just return to Nazjatar and rebuild the pitiful remains of her naga forces? To begin with, they were transformed by N'zoth, so great portion of their powers is gone, and we also broke their kingdom, destroyed the Hatchery and so on.
I see it she can pick up the few remaining naga and settle somewhere near seacoast. But is that all? To rule a small village of refugees instead of the whole world?
I hope Blizz had something in mind when they decided to keep her alive.
So I see 3 general options:
1. She finds a place for nage to live and become neutral for a very very long time or forever.
2. She begins to realise errors of her ways and move on some redemption arc, helping us agains Sylvanas\Jailer\Void\Legion\Whatever next evil.
3. She starts to plot in hopes to return power, making a pact with Tichondrius\Void to release Sargeras\summon Voidlords' forces to Azeroth.
Surely, anything is possible here. What variant you see possibe\desirable?