Cersei: 1) she's not pregnant, senses Jamie slipping away, trying to draw him closer; or 2) she is pregnant, but will face trouble re Maggy the Frog's prediction to child-Cersei that she would have 3 kids and die by her little brother. That would mean she and the baby would die in childbirth, and indirectly die by Jamie knocking her up, who is one of her younger brothers.
Bran: not the Night King. He is high, though (space cadet). Not sure what his function is now, since Gilly discovered Jon Snow's true parentage (if Sam will ever listen to her). Wonder how Sam will react to Dany barbecuing his father and brother, although he is now lord of the Tarley fortune which is sizeable.
The Magnificent Seven: Jon Snow and the others with him beyond the wall. Not all of them are coming home. Why is Beric (he who has been brought back to life six times) there with Jon? Beric has the sword that is arguably Lightbringer. Maybe Jon will be killed but brought back to life by Beric or Thoros and pick up the flaming sword, adding more evidence to the theory that he is the prince to be reborn, etc. There's also some special reason The Hound is with them, he has some special role to play.
Gendry: The showrunners did not bring him back just to die up North, surely. But if he claims his right to the throne as a Baratheon, that puts him in conflict with both Dany and Jon, and Cersei and Jamie. Maybe he's the compromise candidate. He and Arya had the beginnings of a relationship before he was taken away by the Red Priestess for the leach ceremony. Also, Gendry was tutored by [can't remember his name], the blacksmith who Tywin Lannister hired to melt down Ned Stark's huge Valeryian steel sword into two Valeryian steel swords. Jon Snow needs Gendry's blacksmith skills with Valeryian steel and dragonglass.
Dragons: one of the dragons will die. Drogon was wounded by Qyburn's Scorpion crossbow. i fear there is a reason it is named "Scorpion." Scorpions are poisonous. Was the arrow tipped with poison? If Drogon were ever conscripted by the Night King, would he breath ice instead of fire at people? How effective will the dragons be in the middle of a blizzard, anyway?
Lot of questions to resolve in the next 8 episodes. Keeps it interesting.