Originally Posted by
Gurmech
That is pretty much exactly it, the Sethrak have had almost no development since their debut, what little they have has been as NPCs in Dazar'alor where they represent Sethraliss. Also, at the end of the Voldun questline they have the following conversation:
Emperor Korthek says: I did not force anyone to follow me, Vorrik... Our people are conquerors...
Vorrik says: No, old friend. Our people are dead, because of you.
Which to me seems to imply that the Sethrak will probably only be represented once in a while where the Zandalari are present with no government of their own..