Depends, really. They could've had the basic framework for the expansion in place already by the time he joined. Like, Avaloren or whatever the continent ends up being might have been a thing. Iridikron working with the Harbinger might have been a thing.
But all the unique visual flair could probably have been shaped and moulded over the last year. The expansion probably didn't enter full production until roughly around the time Metzen came back.
there are woonz on the other side of Azeroth
It was pretty obvious from the moment they introduced Avaloren as canon that it's where we go next, same with khaz'algar which is probably just a zone/city in Avaloren.
What other Uld facilities mentioned in BfA did we not visit yet?
#1 Hype-Thread Shitposter - Overlord of the Hypethread
#1 Hype-Thread Shitposter - Overlord of the Hypethread
As much as I hate all the discussion: Odyn is definitely gonna be a boss next expansion. He is literally being set up in 10.2, and he tried to reach Avaloren the whole time.
Remember that Avaloren is full of "heretics" in the Keeper's eyes. So if the dwarfs are from there, what are they worshiping?
So this is actually pretty damn cool, if this is how it's all going to line up:
World of Warcraft: Voidstorm (using this as a placeholder name)
- A terrible storm has fallen upon Azeroth, caused by Iridikron/Harbinger/Azshara (have your pick).
- Thrall, World Shaman and master of the storm, guides you on this perilous journey.
- Befriend the battle-hardened people of Khaz Algar, and explore the secrets hidden within Uldaz.
- Brave the fury of the storm atop your Algarian Stormrider and fight back against the Void.
- With the newly empowered Dragon Aspects at your back, you are ready to take flight and go to war.
- Protect the world-soul at all costs, For Azeroth!