Takes

Bran Stark will become the King of Westeros

Bran comes down from Winterfell, stands up out of his wheelchair, and raises his arms and shows he's the true Night King... but I think it's Bran. But it's Bran just because all the betting sites are like Bran.

The Game of Thrones series finale will end with everyone turning into happy zombies

Everything else is fine. All right. That's the M. Night Shyamalan twist... Everybody just turns into a zombie and they're happy forever. They can't go in water, so you at least have that.