It could bet that the queen of hearts is dead. Or it means that they show us the beginning of the rise of her. You know the sentences “The King is dead. Long live the King.” Maybe it means that this is the episode where they show us Coras start (The Millers Daughter story). How she became the queen. What she did for it. Maybe she ws the second wife of the King.
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Heros don't get their Happy Ending!