Scott Lynch has confirmed that he has completed and delivered the manuscript for The Thorn of Emberlain, the fourth book in his Gentleman Bastard series.
The series began with The Lies of Locke Lamora (2006) and continued with Red Seas Over Red Skies (2007) and The Republic of Thieves (2013). The latter two books in the series have been delayed as Scott has had significant health issues.
Three more books are planned for the series: The Ministry of Necessity, The Mage and the Master Spy (title subject to change) and Inherit the Night.
With the manuscript complete, there will now be revisions, rewrites and edits before the book can be published. Due to this, I suspect we will not see the book before 2020. This is still great news, and Lynch gets bragging rights for being the first of the "Unholy Trifecta" of long-delayed fantasy novels (along with Patrick Rothfuss's Doors of Stone and George R.R. Martin's The Winds of Winter) to get to print.