Ex-Blizzard employee here.
As expected, the next expansion will be a world revamp but not all at once. Iridikron and Xal’Atath will open the way for the void lords to consume Azeroth so most of the planet will be covered in void. (In the sense that some zones will be separated by void while other completely engulfed by it). It’s the best way we found to make a revamp without having to do everything at once. So we’ll start by having access to a few zone and we’ll expand with time. It’s done that way because we started all the zones from scratch. We realized very early that old zone are about 1/3 - 1/4 the size of modern ones and keeping them this size felt off.
The focus is not ONLY on the void. The xpac takes place in Lordaeron and Quel’Thalas/Quel’Danas (Quel’Thalas is gorgeous). Scarlet are a problem. What’s left of the Scourge is a small problem. And having everyone stuck in this small zone is a problem because of resources. And of course void creatures.
Lordaeron City is the main hub. Main cast is Thrall, Jaina, Velen, Calia, Lilian Voss with some familiar faces having smaller roles as well.
Fun fact: We made the Vindicaar crash at the beginning to explain why we don’t use it to go to other zones. That’s also why Velen is there.
The point is having more zones opening with time and finding out what happened there during that time. These zones will have their own issues as well so not everything is related to void. We didn’t want a Cata 2.0 in 10 years. There’s an in-game explanation as to why we can’t open portal to other zones. I think it was because of leylines corrupted by void or something, unless they changed it since I left.
Also, Bronze dragons allow us to go back in time to the normal, now old, zones. Cause we still gotta have access to capital cities and stuff.
All that to say that we’ve been working our ass off in the last couple of years making this. I see a lot of assets getting leaked and there are MUCH more. I hope you guys like it.