The Obsidian Mirror series does not have a new book coming out soon. The latest book, The Speed of Darkness (Book 4), was published in May 2016.
The first book in the Obsidian Mirror series, Obsidian Mirror, was published in April 2013.
The Obsidian Mirror series primarily falls into the Speculative Fiction genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.