Originally Posted by
McNeil
Nathanos, either his own fight or as part of the Sylvanas encounter. I wouldn't be surprised if the Jailor gave him a new big body where he is even more snarkier than before.
Helya is likely. She has played an active role within the Maw and has order around the Forsworn, and I doubt that she'll get another raid of her own.
Mueh'zela is still around and was working for the Jailor to send the souls of trolls straight to the Maw, so he could possibly be there aswell.
Ve'nari's cartel could still be active and maybe become a boss fight, though I expect most of the broken stuff will be left for the mega dungeon.
Other irredeemable souls of known characters could always show up. Garrosh may have been send here after Revendreth, Gul'dan is evil enough to warrant his own spot, and maybe Arthas is there which we need to save to give Uther some closure.
Tyrande could become corrupted where she is overextending and falls into a trap. Maybe part of the Sylvanas encounter so we get to fight 2 elf chicks at the same time..