Sorry to  revive an old post, but this a relevant update.  I just checked the link given in the previous post and the date has been updated.  The audio book version of TUC is to be released on Oct 1, 2017.  I'm so excited.  I've already bought the book in print, and I will be getting the audio version as well. 


https://www.recordedbooks.com/title-details/9781501976865