Amazon is like Disneyland. It just does everything bigger and better. Other groups try to do parades. Disneyland does parades better.
So the latest change to the book industry is an increase in subscription based book reading. In other words, books are following the Netflix/Hulu model. You pay a flat monthly rate to read any of the books available in the site's electronic library.
In response to a few of the book subscription places that have been popping up such as Scribd, Amazon has started a new program called Kindle Unlimited. And, like Disneyland, they just do everything better. They already have a huge library of books and now they are giving authors a legitimate reason to be exclusive to Amazon.
Frankly, I think this is awesome. In my opinion, this is the future of ebooks. This will completely eliminate the debate as to wether or not ebooks should cost the same as hard copies. And it is also HUGE for short story writers. We will no longer have to rationalize every cent we charge for our brain children. If readers are paying a flat monthly rate it doesn't matter what the price is.