So, my wild-azz guesses as to what happens.
Cersei does finally kill Jaime. He dies in Brienne's arms. Freeing her up for Tormund's love.
Bron kills Cersei with the crossbow meant for Tyrion and Jaime.
The Hound vs The Mountain in an epic death match.
Jon and Dany are both killed, leaving Gendry, the surviving heir to Robert Baratheon, to take the throne. With his queen Arya by his side. Fulfilling both Ned and Robert's dream from season 1 of uniting their houses in marriage. Tyrion is hand of the King.
Sansa stays Queen of the north, where Podrick introduces her to his Magic Caulk.