I was running back and forth between zones and would run up and kill the placeholder every time with no luck. I was bored this morning so decided to see how many Malgrin/Illsalin I could kill without getting a Deep Orc to agro me. After one clearing of the Malrin's, Grelang popped at 599, -712 (outside and northwest of where Shiven spawns). My guess is that now any of the Malgrin/Illsalin can be a PH. I don't remember what was there beforehand.
He hangs out over inside the little shiliskin town near the back of the non-kill on sight slaver place... keep invis up to get to him cause nothing i saw could see invis on the way to him... he hangs out inside a room FULL of extra mobs... good luck youll need it