December's White Dwarf mentions that the next Horus Heresy book Inferno will be here this coming month. However, it's now apparent that there is a delay in the book, and we should not expect to see it until February.
Huge thanks to Lady Atia on the War of Sigmar for grabbing the images.
This is the quote from December's White Dwarf
This month sees the release of the latest highly anticipated volume of Forge World's Horus Heresy Series. The Horus Heresy: Book VII - Inferno brings the war to Prospero. No matter where your loyalties lie, there's something in this weighty tome for you.