my opinion
-The tomb opens (like argus)
-Jailer evil speech
-Sylvanas sad face (turn into smoke and run away)
-Sanctuary of the Arbiter destroyed
-Jaina teleports us to korthia (like Khadgar in 7.2)
as a result we have
-new location is open and no one cares about it
-typical villain "this place will be your tomb"
-no answers for sylvanas