1) There are still a number of rumors that Amazon is going to launch a new version of the Kindle Fire (most likely more storage, a better screen and a faster processor). With the launch of the Google Nexus Tablet Amazon continues to lose market share in the 7 inch tablet arena.
2) The lighted Nook is still a very attractive alternative to the current batch of eink Kindles and Amazon will need to introduce a lighted Kindle to complete.
3) The current generation of eink kindles have been out of stock. Right now the 3G Touch is only available as a refurbished model and the regular Kindle Touch is only available new. The Kindle 4 and the Kindle with Keyboard are both available new, but not refurbished. And the somewhat odd sized Kindle DX is on sale today for $269 ($110 off).
All of this may still mean absolutely nothing. But I think that it is a sign that the new kindle models are right around the corner.