There are 2 books in the Reign of the Fallen series.
The Reign of the Fallen series does not have a new book coming out soon. The latest book, Song of the Dead (Book 2), was published in January 2019.
The first book in the Reign of the Fallen series, Reign of the Fallen, was published in January 2018.
The Reign of the Fallen series primarily falls into the Heroic Fantasy / Sword & Sorcery genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.