I really don't think there will be a new Kindle next quarter. Amazon is very good at customer satisfaction. Do you really think that they would to piss off the people who are buying it right now (thanks to the Oprah effect)? Remember, there is currently an 11 to 13 week shipping delay for the Kindle.
And besides, software features isn't a good reason to delay shipment so long as the new Kindle can match the features of the old. You can always add new features in a firmware update.