After reading a post in the China Post, that said that an "obscure" book by Tolkien is coming out, I looked around a bit. A previously unpublished book by J.R.R. Tolkien will be published in May 2009. The Legend of Sigurd and Gudrun was written before Tolkien wrote the Hobbit or LOTR. It is obviously a re-telling of a Norse tale. More info on the book can be found at the Tolkien library.