Can someone please explain to me what "The Return of SF" actually is? I may very well end up buying this, but before I do that I want to know a bit more about it.

1) Who or what is Dejohn? Is that his name?
2) Is the book related to Scarface in any way, other than the fact that the cover is a clone of the Scarface DVD cover, and that SF happens to be an abbreviation of Scarface?
3) Is this book officially in print?
4) Is it any good?

Thanks in advance.

PS I'm not bothered about spoilers at all.