Official Suicide Squad Movie Line Up

According to this Blastr article, the official line up for the live action Suicide Squad movie has been cast with Will Smith as Deadshot, Tom Hardy as Rick Flag, Margot Robbie as Harley Quinn, Jai Courtney as Boomerang, Cara Delevingne as Enchantress and Jared Leto as the Joker. I'm not really sure why we need this movie when there are still so many other characters from DC Comics that I would rather see on the big screen.