According to a news story on the Dow Jones news wire last week, Amazon will not be releasing a new Kindle this year. An Amazon spokesperson noted that a new version of the Kindle would not be out until next year at the earliest.
The article is interesting for its references to e-textbooks. Among other points they note that the publishers are not in discussion with Amazon over e-textbook initiatives, and that the devices are not yet ready for what would be required of textbook content. This conclusion is consistent with conversations and information we have gathered as well.