When Qyburn told her that the Wall had fallen and the dead were marching ... He can be the one to deliver the news, either to those at Winterfell or turning back to warn King's Landing.

With an apparent focus on Winterfell and The Wall, it'll reportedly be set around the events of Seasons 4 and 5 of the HBO show, with Roose Bolton acting as Warden of the North and Jon Snow still ...