There are 5 books in the Brotherhood of the Griffon series.
The Brotherhood of the Griffon series does not have a new book coming out soon. The latest book, The Masked Witches (Book 4), was published in February 2012.
The first book in the Brotherhood of the Griffon series, The Captive Flame, was published in May 2010.
The Brotherhood of the Griffon series primarily falls into the Heroic Fantasy / Sword & Sorcery genre.