After seeing Rarity takes Manehattan; I have formulated a theory about how and when the keys to the box we've seen in the premiere will appear, Since there are six locks on the box, each character is going to have to relearn or revise their element of harmony in order for the key to not exactly appear, but be able to be accessed. And they'll each get a rainbow item that represents this. As we all know Rarity obtained a rainbow like thread by the end of her episode. It flashes just as Rarity did in her vision and based on Meghan's Tweets it's no doubt that it'st her key unless Meghan's trolling us. That moment when Rarity looked at the empty seats and the ribbon in front of that shimmered rainbow, as did her eyes, that's that moment of when she relearns her element or whatever. I believe this will eventually happen to each of the mane 6,
So what do you guys think?