Prediction: The White Walkers overrun Winterfell, kill some major characters. The surviving good guys are forced back to King's Landing, where they have to beg Cersei to do something. Cersei continues to scheme as King's Landing is beset by a white walker army, with the heroes trying some last ditch death star run-type plan to defeat them. The fate of Westeros, both in terms of white walker survival and the iron throne is up in the air until the end of the final episode.