Thick As Thieves - Megan Whalen Turner

Yep, it's finally coming out - Thick as Thieves, the fifth book in Megan Whalen Turner's series is going to be published next year (May 2017), according to this interview, which also showed the first images of the cover. 

 

The only downside? With the re-design, the new book isn't going to match the four I already have, but I guess that's a small price to pay...