From:"It's All Good"

Amazon Shorts are short literary works available for purchase--49 cents!--from well-known authors that have never been published anywhere else--and won't be for at least 6 months according to the FAQ. Amazon made a foray into original content a year or so ago when they showed made-for-Amazon short films over a period of weeks. With Amazon Shorts, the line between content seller and publisher just got a lot fuzzier.

In the FAQ:

What types of material can I list as an Amazon Short?
Any previously unpublished short-form work (2,000 - 10,000 words, fiction or nonfiction) you've created that your readers would find interesting. An Amazon Short could be a single short story, an update on a well-loved character, a compelling speech, additional material that enriches your published works, or even your commentary on your work or other subjects. Some authors have chosen to treat this as a "laboratory" for experimentation with new genres, themes, etc. We are open to creative ideas for new work.

This will drive collection development librarians nuts...