Also, something I just realized is that the Winds of Winter cover will apparently look like this:
Another phrase meaning to blow or sound a horn is "winding the horn". Seems suggestive.
As an aside, reminds me a bit of another fantasy series I've read by Richard Morgan, the titles are "The Steel Remains", "The Cold Commands" and "The Dark Defiles". When you see the titles originally, you think the last word of each is a verb, but after reading the books they all turn out to be nouns. The series is worth reading if you like dark fantasy, although not up to his best work (the scifi noir Altered Carbon, being made into a 10 part series by Netflix right now).