According to this Q&A with Phil Tippett, Pepsi’s $3 billion merchandising contract was contingent on Lucas agreeing to direct all three movies.
http://www.movies.com/movie-news/phil-tippett-star-wars/4324
According to this Q&A with Phil Tippett, Pepsi’s $3 billion merchandising contract was contingent on Lucas agreeing to direct all three movies.
http://www.movies.com/movie-news/phil-tippett-star-wars/4324