TF.N has provided a great article from the June issue of the UK's LOK magazine. It had an interview by Robin Hail with Peter Mayhew who plays Chewbacca in the Classic films. Episode III is mentioned in the article.

Robin Hail asked Peter Mayhew how he felt about the prequel trilogy Spoilers - Highlight to read: and Episode III in particular since Chewbacca will make his silver-screen return. Peter replied, “I am very pleased with Episodes 1 and 2. George Lucas is doing a remarkable job. Spoilers - Highlight to read: However, Lucas assures me that Episode 3 with far surpass the other two in both action and story and from some of the pages I have read from the Episode III script, I certainly believe him.” Later he goes on to say, “As you know, none of the actors get the full script of Episode III, but they do get the pages for what scene they are working on. Therefore, I have not read the full script yet, just a few pages with my character.”

After Peter talked about Episode III’s script, Robin asked Peter on the role that Chewbacca will play. I liked what Peter said. Peter replied, “I was told by George Lucas that I would be playing a large part in the story including the delivering of two twin babies and playing a role in a major battle scene that involves many war machines. Sadly, I have not read those sequences of the script yet.”

Some of this information may not be necessarily new news if you keep up with Hyperspace and the latest spoilers. It sure sounds good though! There was more to this article, so head over to TF.N if you want the whole article.