In one of the newest entries in his NotaBlog George say that he has just finished two chapters. One with Arya and one with Sansa. Arya AND Sansa in aDwD! Interesting. But George did say that aDwD would last a couple months longer than aFfC, and might contain some chapters in the end to keep the southern storylines up to pace. Or Sansa could be going to the north or the eastern continent. Both interesting possibilities. Littlefinger did talk about using Harry the Heir to take back winterfell in Sansas name. And in one of his earlier updates he did mention writing a wedding. We suggested at the time that it might be either Sansa or Dany getting married.