There are 4 books in the Memory, Sorrow and Thorn series.
The Memory, Sorrow and Thorn series does not have a new book coming out soon. The latest book, To Green Angel Tower, Part 2 (Book 4), was published in January 1993.
The first book in the Memory, Sorrow and Thorn series, The Dragonbone Chair, was published in January 1988.
The Memory, Sorrow and Thorn series primarily falls into the Heroic Fantasy / Sword & Sorcery genre.