As per usual with our dungeons, post-completion content will be forthcoming in future patches.
Thanks.I'm sure the writers can give more details (if they want) but we know from some things they've already said and which were implied by Tollus in the dungeon that the cult's next plan involves the area north of Winter City which is planned for the future. One imagines Ahmri will show up there if you went the 'corrupt the village' route but that's just a guess.
On Naiyana, quoting Savin from the earlier backers build: