But which role will he take, assuming it works out?Though Warner Bros. has been reluctant to confirm anything officially – presumably because details still need to be worked out, contracts signed and press releases written – it would seem Dwayne Johnson is eager to keep being a one-man PR unit for his potential role as someone from the DC Comics title Shazam.Talking at a news conference in Mexico City where he was stumping for Hercules, Johnson told the gathered media – as reported by the Associated Press – that he’d be playing a role in a Shazam film.