Timothy Zahn's celebrated Star Wars Expanded Universe novel Heir to the   Empire has reached its 20th anniversary and to celebrate it Lucas Books   and Del Rey is releasing a special hardcover 20th Anniversary edition   complete with annotations from Timothy Zahn and others involved in the   making of the book.
Leading up to the June 21st release of this book, 
Star Wars Book on Facebook (Del Rey's official Star Wars Facebook site) will be teasing fans with excerpts from select annotations.  
The third annotation released on Facebook: 
"Originally,  I had had Rukh and his fellows being Sith, keying off Vader's title of  Lord of the Sith. Since at that point the term hadn't been defined, I  figured I was safe. But Lucasfilm was concerned that George would want  to use the Sith at some future date (which, as we all know, he did) and  told me to pick some other term for them." --Timothy Zahn

This is one that some fans had heard before and some fans have not.  I think its interesting in that it illustrates just how far the Star Wars universe has expanded from the small snapshot of it we got in the movies.  
Visit Star Wars Books on Facebook for the latest book news, giveaways and cool fan interaction.  LINK TO ANNOTATION #1LINK TO ANNOTATION #2