Everything is speculative except for what's officially coming from Blizzard. Even datamined assets is just pure speculation, because we have no idea of their context 99% of the time, or even if they'll ever see the light of day.
- They've chosen to advertise WoW's presence at BlizzCon with Thrall.
- In-game story suggests that these locations may be introduced at some point in the future: Avaloren, a place beyond the waves, Khaz Algar, and Uldaz. But it's not a guaratee, and they might just be mentioned to fill out the world a bit.
- Similarly, these characters seem to be active now and in the near future: Thrall, Tyr, the Dragon Aspects, The Harbinger, Iridikron, Queen Azshara.
- The world-soul is healing but here future is uncertain. Some "dark heart" awaits the taking. The Harbinger will attempt to complete an "awakening" before Queen Azshara returns to rule the sky, land and sea.
That's it. That's what we know.
Light vs Void.
Order vs Void.
Life vs Void.
Dragon betrayals.
Tyr going bad.
World revamps.
Caves.
Elementals.
All of that coming from players looking to put together pieces of the puzzle. Myself included.