Star Wars: Episode III: In the recent Star Wars Insider Newsletter, designer Ian McCaig talked about some interesting topics, revealing some of the plot of Episode III:

"In Episode I, when we saw Jake Lloyd, we wondered where's the dark side? Why isn't this kid creepy? And then, in Episode II, Hayden Christensen came across as a justifiably angry teenager more than a kid who crosses over to the true dark side. Killing the Sand People... they killed his mom! I could go mad and do something like that. So, I kept waiting for the dark side to take hold. In this film, you realize, it's more about Anakin making the wrong choices. He's given a glorious moment by George -- I'm so happy with part of the script -- where he truly has to make a choice. In the end, I think that's a smarter way to go than a slow transformation. It's more tragic this way"
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McCaig also spoke about the Queen's costume design for the 3rd film:

"In Episode I, she was the Queen, and she was wearing disguises. I once said she should be able to slip out of the back of the costume, and you'd never know she was gone. Ironically, in this one, she's back to wearing disguises. As well as now hiding this marriage to a Jedi, which is not allowed, she has to hide the fact that she's going to have babies. All of the costumes had to disguise these facts"