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In the back-to-back season premiere episodes, titled "The Beginning of the End," Princess Celestia and Princess Luna decide to retire and hand off the ruling of Equestria to Twilight Sparkle and her friends, which sends Twilight into a tailspin of self-doubt. Meanwhile, an ancient villain bands together a legion of nefarious characters to conquer all of Equestria, challenging Twilight Sparkle and the rest of the Mane 6 to step in and save the day.
This is... fan fiction.
I had always speculated somepony was going to have to give. Well techincally I still could be very wrong I wonder if the the princesses are still going to be in the show 90% sure yes but there is a chance that they may have them go out somewhere else and only come back for a couple of episodes.