I was reading online the new issue of Time that has the Star Wars articles in it. I only read about 1/3 of the main article (don't have a subscription) but Hayden Christensen said that George has a few plot twists that he believes will surprise people. I hope this turns out to be true. It seems like Lucasfilm has let more spoilers out with Episode III. Usually they are very tight with that sort of thing. Hopefully there are a few surprises still left in store.