Reynolds rose to fame with the initial Revelation Space trilogy - Revelation Space (2000), Redemption Ark (2002) and Absolution Gap (2003) - and a standalone spin-off, Chasm City (2001). He later added two prequels, The Prefect (2007, reissued a decade later as Aurora Rising) and Elysium Fire (2018); a novella collection, Diamond Dogs, Turquoise Days (2003); and a short story collection, Galactic North (2006).
The new book is called Inhibitor Phase and is set shortly after the events of Absolution Gap, which saw the defeat (more or less) of the machine intelligence known as the Inhibitors, who were trying to prevent the rise of sentient organic life in the galaxy. The new book is not intended as a continuation of the main series, but will be a standalone book.
All being well, Inhibitor Phase should hopefully be released in late 2021 or early 2022.