Here's something to occupy your attention until the Amazon event next week.
One industrious Kindle fan was digging through the source code of various Amazon webpages when he found something rather interesting. There's code hidden on the "Manage Your Kindle" page that suggests that Amazon are now tracking which Kindles can be used with something called "Prime_Ebooks". Gee, I wonder what that could mean?
Snarkyness aside, this is probably closely related to a story from a couple weeks back. The WSJ reported that Amazon had tried to negotiate some type of subscription plan with publishers, but they didn't go for it.
At the time, everyone pretty much assumed that the ebooks would be free with an Amazon Prime membership. It would work similar to the free streaming video that Amazon offer now. As you can see from the code above, Amazon are clearly planning ahead.
There's also code later in the page that (should Amazon ever offer this service) will be part of a menu. There are 2 menu options named, and they mention returning and deleting these ebooks. They would work much the same as the library ebook options work right now and in fact they say exactly the same thing.
All in all, this is an interesting confirmation of that older story but it's not actually new.