Here's the "Official" response to this story

http://starwarsblog.starwars.com/index.php/2010/11/15/major-empire-spoiler-actually-dropped-in-1977/

Is it just me or does LFL's attitude towards these story's stink. An article surfaces suggesting Prowse knew about Empire's secret plot reveal, they trace the evidence back to an old fanzine who interviewed Prowse and all they have to say about it is correct the date to 1977!

We've all been told Prowse didn't know the big secret plot twist, we find evidence that he may have known as far back as 1977 and all they can do is comment on the incorrect dating in the original article!

Typical LFL BS. This, along with their reaction to the 3-D backlash just proofs that they're not in touch with a large portion of their fans.

Sorry, that's my rant over. Just wanted to share this.