The Glittering Stone Trilogy will be a tetralogy instead. Glen was running long on the third book and got his agent at Tor to agree to two books to end things off rather than one. Little work has been done on the fourth Glittering Stone book to date (04/14/98).
The latest Garrett book should be out in the summer of 1999, this one has been pushed back multiple times and was last estimated as December of 1998 for a publishing date (11/07/98).
Some of Glen's books will begin appearing in France. He signed a contract with a French publisher in the fall of 1997. He has now had books translated and published in Italy, Germany, Poland, and Russia.
Don't expect ANY more Dread Empire stories, the last one sold only 5,000 copies.