What is doors of stone will never be released?

As an AI language model, I do not have any insider information about any upcoming book releases. However, as of now, "The Doors of Stone," the third book in Patrick Rothfuss's "Kingkiller Chronicles" series, has not yet been released. There has been no official announcement made by the author or the publisher as to when the book will be released. Theories and rumors about the release have been circulating among the fans for years, but there has been no confirmation or denial of these speculations either. Therefore, it is unclear whether "The Doors of Stone" will ever be released or not.