(Spoilers extended) „WINDS, you say? Yes, still working. Finally finished a clutch of Cersei chapters that were giving me fits. Now I am wrestling with Jaime and Brienne. The work proceeds, though not as fast as many of you would like.“

New Blog post. Also mentions HotD and a tidbit that might hint he would let anybody other than him finish Asoiaf.

I wish he had written more. He had been working on a novel called BLACK TRAIN COMING even longer than I have been working on THE WINDS OF WINTER. It would be great if one of his writer friends finishes it for him.