Although I guess "cashing in" doesn't really apply since he's already plenty rich from the series.
http://news.yahoo.com/s/nm/20051025/od_nm/life_starwars_dc "Star Wars: Where Science Meets Imagination," opening on Thursday in Boston, was developed by "Star Wars" creator George Lucas's LucasFilm Ltd. and Boston's Museum of Science to give some scientific basis to the fantasy of the films.