Buddy TV article reports:
He was originally brought in to play the leader of a local rock band for three episodes, but Federline made such an impression on the producers that he was brought back for a regular gig. It hasn't been said that whether he will be integral in the plots, or even have an arc, but he will be present throughout the season, and therefore will have plenty of bucks to support his two new responsibilities.
One Tree Hill blog for those interested in more information.
Session 5 of One Tree Hill will begin January 2, 2008.