Originally Posted by
Nymrohd
Thros seems the most likely bet. First we wrap up the Revendreth storyline, next up would be either Ardenweald (stop the Drust in Thros) or Maldraxxus (take down the House of Rituals and probably Kel'thuzad in Naxx 3.0?). The Bastion storyline seems like the one that can be wrapped up with no raiding involved.
Helheim is interesting. My personal bet is that the person who helped the Jailer bork the Arbiter was Hel so perhaps the final raid takes place in both Helheim and the Maw. I definitely want to see Hel and Sylvanas interact again.