It just looks like a larger Nar'thalas - and what I imagined we would get in Thal'dranath, which was ditched. Did they just paste that zone for Naz'jatar.
This would explain the severe lack of a proper naga section or city.
It's mid expansion, they don't do new sets in mid expansion, which might explain why only the Eternal Palace looks naga, but lore wise that surely can't be all the naga have after 10,000 years.
The fact that we don't see it, probably means that this set for 8.2 is the unfinished Thal'dranath.
They have either just completely ignored the rest of the naga home and done a patch job like they did Argus, or they are planning more from it in the next expansion when they have more time to build a proper set.