I don't remember if it's been already discussed, but is Khadgar officially the new Guardian of Tirisfal?
Because in Legion he can be found in Dalaran, in a new location called the Chamber of the Guardian.
He has Atiesh, Greatstaff of the Guardian.
He was Medivh's apprentice.
In the movie, there's a lot of winks about him being the next Guardian.
If he's not, is there something in Legion that will grant him the Guardian's powers?