There are 3 books in the Babylon 5: Legions of Fire series.
The Babylon 5: Legions of Fire series does not have a new book coming out soon. The latest book, Out of the Darkness (Book 3), was published in October 2000.
The first book in the Babylon 5: Legions of Fire series, The Long Night of Centauri Prime, was published in December 1999.
The Babylon 5: Legions of Fire series primarily falls into the Space Opera genre.