So when you finish the dungeon he says this. I used to assume he was referring to other stuff that needed to be done concerning the fact we were in neltharions lair.Spiritwalker Ebonhorn yells: The power of the mad king Dargrul is broken and Highmountain has you to thank, heroes. Now, there are other family matters that require my attention. Farewell, I hope when next we meet it is under more peaceful circumstances.
But it just occured to me, what if he's actually referring to the Black Prince? We are rather starved of information though