Jim Butcher some time ago wrote the first book of an expected new series, The Aeronaut's Windlass. Then he just kind of went on hiatus for most of a dedicate, including a 6-year sabbatical from Dresden Files. But 8 years later, he's now published The Olympian Affair, the next book in the Cinder Spire series. In that time, George still hasn't published Winds of Winter.