The Hollywood Reporter says writers from The Shield have been hired to write for Will Smith's Hancock sequel:-

Columbia has hired scribes Adam Fierro and Glen Mazzara to pen the sequel to Will Smith superhero movie, which grossed $624 million worldwide last year. The original producing team is expected to return. Plot details are being kept under wraps, though the scribes will work with Smith and director Peter Berg to build on the world hinted at in the first movie. The original starred Smith as a boozy, irresponsible superhero who undergoes an image makeover by a public relations man. It later is revealed that the hero is part of a line of immortal beings who have been around for more than 3,000 years and begin to lose their powers when in proximity to fellow immortals.