The comic-books were originally going to be adapted into a movie written by Josh Olson (A History of Violence), but it proved too difficult because of the story's complexity. Del Toro will now co-write the TV pilot with Steven Thompson, and likely direct if HBO take it to series.
In related news, Del Toro is also producing a TV adaptation of Corinne May Botz's 2004 non-fiction book The Nutshell Studies of Unexplained Death, about Frances Glessner Lee; a man who recreated macabre crime scenes using doll houses and thus influenced modern forensic investigations.