http://www.amazon.com/Leviathan-eboo...0919580&sr=1-1
I don't think Amazon wants to get all that deeper into publishing -- just enough to scare the bejeezus out of the publishers. It may also be an invitation to authors that if ebook rights on backlist titles do get cleared up in their favor, that Amazon may be willing to work with them on publishing those titles.
It is worth noting, by the way, as much as you despise publishers, working with them generally reduces the numbers of exclusives whose audience is restricted via vendor lock-ins.