the album is called thirteen (or 13) and the next single is called lover
• Taylor has been insisting a lot on numbers and counting things, and especially the number 13. we know she loves the number 13 but this is pushing it. and we know it's been 13 years since her first album.
• there are 13 clouds (and she told us to count the clouds!)
• as @piercetheroomlikea pointed out, she takes 13 steps before she jumps in the hallway scene (and she said the hallway scene was important)
• she said the christmas tree was a clue, and what if it's just to reference the month of december, aka her birthday, aka the 13th?
• if you turn ME! upside down it looks like 13W and idk what the w could stand for, maybe nothing, but you can clearly see a 13
• taylornation sent some swifties hats that say "13 world tour"
as for lover, i just feel like it can't be a random sign, it's gotta mean something, and the most logical guess is that it's the title of a future single