Blizzard have addressed two quest bugs that have been preventing players from continuing the 12.1.5 story. One quest has already been fixed, so if you had issues with “What the World Sees”, just wait for Arator to respawn. “In the Belly of the Beast” is still being worked on, but a fix should come soon.
“What the World Sees” should be fixed now! Just give Arator some time to respawn if he’s missing on your realm. 
Thanks for the reports! We’re looking into the issues where the quests “In the Belly of the Beast” and “What the World Sees” cannot be completed.
