Cthulhunicron said:
Does anyone have a link to an interview of George Lucas stating that he had the whole story planned out from the beginning?
This is an interview given by Lucas in 1995; it's one of three interviews released as part of the digitally remastered box-set that was released the same year. Lucas specifically states (at approximately six-and-a-half minutes) that he had the backstory for both the prequel films and the original trilogy planned out.