THR was first to report that Warner Bros. was looking at Ryan Gosling, Will Smith, Tom Hardy and Margot Robbie for roles in Suicide Squad. The DC Comics film will be next installment of the DCU after the release of Batman v Superman. Deadline is now saying that Smith and Hardy are very close to signing-on, while their roles aren't being named. The film's script is undergoing a couple of rewrites, but is expected to go into production very soon. It's release date is set for August 6th, 2016, which means it will likely shoot during the spring and summer of next year.
UPDATE: Deadline has updated their original story, by adding that Margot Robbie is also close to signing-on. Robbie was attached to lead Ghost In The Shell, but Dreamworks has gone with another actress. She recently worked with Smith on the con-artist movie Focus. I'm curious if Will Smith might end-up taking the Deadshot part, while Hardy taking the roguish role of Harkness.