The story around the Throne of Thunder seems like a bit of a closure for the Zandalari storyline. But we still don't know who Zul is. Are we going to see more of the Zandalari or Zul in-game or will that be part of the upcoming Vol'jin novel?
Vol'jin will definitely run across the Zandalari in the novel. The events in the novel kind of take place after patch 5.1 and before patch 5.3. And the Zandalari story is far from complete. You don't encounter Zul in 5.2 and you don't encounter King Rastakhan who is still sitting on his throne at Zandalar even as Zandalar sinks into the sea. So you're going to learn a little more about their backstory, but it won't be finished in patch 5.2.
buffed.de, Interview mit Dave Kosak
Does Rastakhan support what Zul and his followers are doing? I know he didn't believe Zul's visions at first, but now?
Rastakhan was only humoring Zul until the Cataclysm struck. Afterwards, Zul commanded a lot of respect among the Zandalari. Rastakhan's empire is sinking into the sea, and only Zul has a way out - I think he supports the prophet. We'll see more of the Zandalari... someday!
Live Developer Q&A, Dave Kosak (Fargo)
Ok ok....also Rastakhan lebt noch, die Story um die Zandalari geht irgendwann weiter UND er wird nicht als Bossencounter verheizt...wie derzeit der andere unbedeutende Rest der Trolle.