This article is from the Kurt Vonnegut FAQ, by George A Cooley firstname.lastname@example.org with numerous contributions by others.
This is still a work in progress that is supposed to be Vonnegut's next
and final novel. It was originally due to be published by Putnam in
1994, but then got pushed back to 1995, and is now "indefinite." Some
people have the mistaken impression that it was published but then
yanked from the shelves, or published and now just really hard to find.
I read an interview of Vonnegut last November in which he said that
he is frustrated with it, unhappy with how it's coming, continually
rewriting this part or that. He said that it's his last book and he
doesn't want it to be a flop, he really wants to end his writing career
with a bang.
In any case, there's no telling when this will be published, or if it
ever will. All we can do is hope, and keep our eyes and ears peeled!