From the FIFA website:
"France, the defending champions and gracious hosts of this 2003 edition are joined by Brazil, the winners of the 2002 FIFA World Cup Korea/Japan™, along with Cameroon, Columbia, Japan, New Zealand, and the United States, the reigning champions of their respective confederations, as well as Turkey, invited to join in recognition of their performance at the 2002 FIFA World Cup Korea/Japan™."
Guess that explains it.