Fast Forward Entertainment has announced that it will be producing a series of d20 products in a new d20 campaign world based on the Demon Wars novel series by R. A. Salvatore.   According to Fast Forward President Jim Ward, the first product will be a 128-page hardbound book priced at $24.99.  'The first product will introduce character classes and the magic of the Demon Wars saga,' he said.  It's planned for launch in April 2003, and Fast Forward hopes to release a total of four new Demon Wars products each year.  Demon Wars is also going to be a comic series from CrossGen's Code Six imprint (see 'CrossGen Signs First Code Six Title'), so this property is going to be acquiring considerable momentum in 2003.