It looks like Martin is fully dedicating himself to finish the Winds of Winter for next year, some estimate that it will be finally published on july or august 2020.
Some have speculated that the delay was caused in part because of Martin not arriving to decide himself on several major deaths and how to make them : the ones I expect to die are Stannis Baratheon, the Boltons, Walder Frey and a good portion of his family, Tommen, Shireen (sadly), the NW mutinees, one or two of the Tyrells but certainely not all of them unlike in the show, Daven Lannister, Illyrio Mopatis, Aeron and Victarion Greyjoy and Hodor.
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This book may also finally confirm Jon's true parentage just like in the sixth season of the show, see the beggining of the return of the Starks and the first true appearance of the Others/White Walkers as a threat to all of Westeros and of Howland Reed.
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It may also shows Daenerys embracing her family ruthlessness and violent tendencies and methods to get what she wants as foreshadowed during her last chapter in ADWD and it's certainely not going to make her popular in Westeros especially if she decides to wage war on her alleged nephew who's most likely going to take the Iron Throne and to be much more beloved by westerosi than her.
