The Star Wars Complete Saga box set, to be released on Blu-ray this September, will feature a John Williams interview as part of one of the documentaries included on disc 9. Here’s the official description:
A Conversation with the Masters: The Empire Strikes Back 30 Years Later (2010, Apx. 25 Minutes): George Lucas, Irvin Kershner, Lawrence Kasdan and John Williams look back on the making of The Empire Strikes Back in this in-depth retrospective from Lucasfilm created to help commemorate the 30th anniversary of the movie. The masters discuss and reminisce about one of the most beloved films of all time.