Seems... somewhat interesting, but at this point I'd be happier if they'd just start working on WoW 2 or another MMO instead. The WoW engine's getting old, and the history of Azeroth and the big threats that constantly pop up are getting a bit stale.
At least this expansion doesn't seem focused on a big baddie invading everything again. At the same time though, after the Alliance and Horde have allied to fight these big baddies again and again though, having constant conflict between them just seems forced.
I'd rather they gracefully bow out on a high note with WoW rather than just running it into the ground, as Legion seemed like a good place to finish. With the number of subscribers dropping over time to the point where they refuse to even release the numbers anymore, I feel like they should stop trying to milk this almost dry cash cow and try something new.