Comic Book Resources provides details of the deal, noting that the run will consist of four issues, each forty pages in length. The story will serve as a prequel run-up to Superman Returns, "revisiting the Man of Steel's origins and witness how the world has been transformed in Superman’s absence." (taken from the press release statement)
As a fan of both comic books and (most) comic book movies, I tend to like anything which attempts to unite the two. Naturally, I prefer the movie to resemble the comic book; but in instances like this where a clear movie story line is existent as a somewhat separate entity, I think it's nice to see comic books which recognize and enhance the separate story.