The Mexican filmmaker confirmed that Marvel Studios has an unnamed scribe in mind for the project, and is keeping it on hold until negotiations have been finalised.
"Right now all I know is the official word I was given is that there's a writer they want," del Toro told Shock Til You Drop. "They are very interested in me meeting with him. He's very, very busy. The official word is we are holding."
However, the Pan's Labyrinth director went on to say that the box office success of the Avengers movie could have a bearing on the future of the show.
"After Avengers having the success it had, perhaps the fate of the project may change," he added.
"Right now officially what I know - and I'm not hiding anything off the record or anything - is that we were told we were waiting for this writer, and we were going to do it with him."
The Hulk show was previously touted as part of ABC's 2013 schedule.