The Magic Most Foul series does not have a new book coming out soon. The latest book, Twisted Tragedy of Miss Natalie Stewart (Book 2), was published in November 2012.
The first book in the Magic Most Foul series, Darker Still, was published in November 2011.
The Magic Most Foul series primarily falls into the Fantasy genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.