This is what I found about the Journal Of The Whills.
LUCASQUOTE
Journal Of The Whills
But Who The Heck Are 'The Whills'?
By: T'bone
Source: STARLOG, Star Wars: The Annotated Screenplays
Dateline: Monday, June 3, 2002
"...And in the time of greatest despair there shall come a savior, and he shall be known as: THE SON OF THE SUNS."
Ever since the original STAR WARS novel was released, people have been curious to know what exactly this meant. It's credited to something called "The Journal of the Whills," but there's not too much info out there on it. Why not? The whole idea was essentially dropped.
In a 1987 STARLOG Magazine interview, when George was asked what the "Journal of the Whills" was all about, he replied:
I'm not sure I can explain that. It's where the STAR WARS saga came from; it was a larger [chronicle] that I had been working on, of which STAR WARS was just a piece.
In the book Star Wars: The Annotated Screenplays, Lucas elaborates a little more:
"Originally, I was trying to have the story be told by somebody else; there was somebody watching this whole story and recording it, somebody probably wiser than the mortal players in the actual events. I eventually dropped this idea, and the concepts behind the Whills turned into the Force. But the Whills became part of this massive amount of notes, quotes, background information that I used for the scripts; the stories were actually taken from the 'Journal of the Whills'."