Now that the season has ended, what did it "spoil" in The Winds of Winter? I can't think of many things.
-- Jon will be resurrected (although we don't know how or why nor do we know how he'll change)
-- Hodor's name comes from "Hold the Door"
-- Dany goes to Westeros
-- The Children of the Forest created the White Walkers
-- R+L=J
That might be it? It's kind of incredible, really, how few things were spoiled. We can guess if other events will happens (Cercei blowing up the sept, Arya leaving Braavos, Ramsay dying, Sam stealing his father's sword), but I have no idea if they will play out the same way or at all. Chances are that very few, if any, things will play out in the same manner.