Ramsay will definitively get killed by Jon Snow in the battle for Winterfell, I'm afraid for side casualties and Rickon may be one of them, but I have a feeling that he will survive, if only to be the one continuing the Stark lineage after all it's said and done.
Tommen most likely will bite the bullet too, don't know how the endgame with Loras and Margaery's plans will be however. The High Sparrow either emerges out of this season as a dominant force or six feet under.
The Waif is toast also one way or the other I guess. And maybe... the Mountain!!!!