Don't have a whole bunch of information yet, but following are snippets:
The Bazaar of Bad Dreams will include 20 stories (a mixture of new writinge and world already collected in magazines) and feature King’s first major insights into the writing process since his 2000 memoir On Writing
There will be introductions to each story by King in which he will provide “autobiographical comments on when, why and how he came to write it”, as well as “the origins and motivation of each story”.
Confirmed stories are:
A Death
Drunken Fireworks
UR (revised)
Bad Little Kid
Descriptions of others:
“a man who keeps reliving the same life, repeating the same mistakes over and over again”
“a columnist who kills people by writing their obituaries”
“a poignant tale about the end of the human race”