Finally watched this, and I think Tali was far afield on some of those 9.1 next realm guesses. Capitalist paradise Brokerland seemed like a reach. The various ethereal/energy-beings-in-clothing we've seen before get some of their feel of being Cool Outsiders because we don't ever see where they came from. If Blizz did it, it would feel like Mechagnome-land did-- kinda off the point. Maybe as a later distraction/minor dungeon realm like Mechagon was, but not a place for main plot/raid.
Evitel seemed more on point-- more Death realms. I was really surprised he didn't lead with or even mention the Drust-- that's a realm of the dead we've actually dipped toes into, recently, with an antagonist we didn't fully resolve. I always figured Blizz had a raid in the pocket for it, but delayed it. Even if Blizz did go for the Emerald Dream again, they'd need an antagonist, and given the Drust invasion currently, they'd be top of choice for that too-- but then, why not do their own place?
The one thing I hope for is more bright places, less super-dark. My old eyes are really tired with the purple-on-dark-grey-on-black places, and having to lock myself away from any light to play.