Given hero talents are now a thing it will be a midnight thing if it happens. Trying to pull an Augvoker and shoehorn it in mid expansion would require building a new hero tree and removing one of the existing hero talent options from all demon hunters. This is a massive undertaking and would generate massive Ill-will from players when it could be rolled into the massive class rework that happens each expac when players expect radical change.
Finally we would see them adding tie-ins to the upcoming sets as they are hero spec based.