I could see them adding some specs to existing classes sort of like alternate jobs. Like what they should have done with legion's survival hunter.
Mage hero spec- Enchanter - (wields floating weapons like Kaelthas in Tempest keep)
Hunter hero spec- Dark Ranger
Priest race specific glyph spec - Priestess of elune
Rogue hero spec - Warden
Paladin hero spec - Crusader
Monk - scarlet monastery style