Nalorakk, as well as the other 3 Loa of the Amani (Dragonhawk, Lynx and Eagle) have been known to us for a while
The music is from the War Within, by the way. The heavy military-themed one from the launch cinematic, and also features in TWW's login theme.
In Zul'Aman we'll be interacting with two of Zul'Jin's grandchildren. The Vilebranch tribe seems to be villainous, and the Loa silent despite the threat of the Void. So we'll be aiding them (probably slightly reluctantly).
I also love how Zul'Aman looks quite dreary and somber. With lots of ruins, rain and overgrowths. Really the rugged lands the High Elves didn't want to take.