A patch that leads us back to mainland Azeroth, maybe the Pandaren waving goodbye as our ships sail. Gameplay wise wouldn't make a difference, but lore wise it gives closure to the storyline that our factions' main heroes who were on Pandaria returned to mainland Azeroth. Maybe that was already accomplished in SoO, so maybe Garrosh trial and Anduin freeing him after a pity story of only trying to please his father.