So I've delivered a new novel. We have a possible title, but it's still subject to discussion and may well change, so I won't mention it just yet. What I can say is that the new book is the first novel-length work to be set in the Revelation Space universe since 2007, and is also a sequel to The Prefect. Despite the decade-long gap beween these books, this one is set only two years after the last and features a large number of recurring characters. Nonetheless I hope that it will be capable of being read independently of the first.
As far as I am aware publication is not likely to happen until early 2018.