Tuaw posted a picture that is said to be taken from Apple's own site. The picture shows a 12 inch and a widescreen 14 inch iBook with the following text on the top: "See everything in widescreen".
However, the picture and the text on top of it look a bit fake. It's probably a Photoshop work based on recent speculation that iBooks will get widescreen. At least we have an idea of what could look like a widescreen iBook.
Last month, a report from one of our sources detailed some technical specifications that the new iBooks could have but did not mention any form factor change.

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