It's been a while since we last heard from Joe Abercrombie. In fact, it's been two years since his previous novel, Half a War, was published and a year since his last book, the short story collection Sharp Ends. For an author who's been pretty prolific over the years (ten books in ten years), that's a surprisingly long time.
In a new update, Abercrombie reports that he is approximately halfway through writing the first draft of the sequel trilogy to The First Law. He is writing the entire trilogy in first draft before he starts revising the first book for publication, a more long-winded process but one which will ensure a more regular publication schedule once the books are done and allows for much tighter continuity and editing.
Based on this and his prior statements, it sounds like it may be late 2018, if not indeed 2019, before we see Joe's next book.