I think Cersei is going to con her way to victory over Highgarden and Dorne, absorbing the armies in the process. Why? To build her military might up for the impending clash against Daenerys. Meanwhile, Jon will have the white walker threat to deal with in the north, and at the moment of impending doom Daenerys will arrive after having defeated Cersei, and Bran will link the two along with Tyrion.
Other notables:
I think the Hound will kill the Mountain with help from Arya.
Sam will become the new Maester of the Royal family.
Daenerys will defeat Euron and give the Iron Islands to Theon and his sister.
Sansa will kill Littlefinger and lead the Vale, after he tries to usurp Jon for the north.
Jamie will deliver the deathblow to Cersei and lead the new King's guard.
Castle Black will get ravaged by the White Walkers
Mormont will be cured and find his way back to Bear Island.