In a translated Korean interview with Steve Danuser and Morgan Day, we've learned that the Sepulcher of the First Ones raid will end with the Jailer, however players will only be able to face 8 bosses culminating in an encounter with Anduin in the first week, with the remaining three locked.
The interview also specifies rescuing Anduin, which implies that the dominated king will not die during our battle.Update: We've received private confirmation from Blizzard that the first week of Normal and
. Read more on wowhead.com