Prediction: Sansa teams up with Littlefinger and pays for it
Both the death of Ramsay Bolton and the reclaiming of Winterfell were huge wins for Sansa Stark, an MVP of the season. In "The Winds of Winter," the cost of kicking ass catches up with Sansa. Jon, slighted by Sansa's back-alley deal with Littlefinger, reminds the new queen of the North that "we need to trust each other." Then comes an interaction with Mr. Baelish, outside and away from any onlookers. "I thought you knew what I wanted," he asks her. She does, because she asked Littlefinger at the Vale. His answer at that time? "Everything."
Is Baelish's quest for power compensating for his unrequited love for Catelyn? Does he project his feelings on Sansa? Is she his everything now? Here's hoping Littlefinger's aspirations come into light. If Sansa, high on her own victory, sticks with the diabolical brothel owner, the two could leverage the Starks' reclaiming of Winterfell into a full-blown campaign towards the Freys and the Lannisters, fueled by their need for revenge.
More shocking, albeit still plausible, would be an end to Sansa's run entirely. If Sansa crosses Littlefinger, or doesn't play nice with his romantic and/or warring intentions, she could end up on the wrong side of a dagger. We'll cross our fingers for more war -- we really like Sansa.