in the long-awaited trailer for the film to be released this september , depp plays james ` white ' bulger - the notorious boston gangster who topped the fbi 's most wanted list for 16 years before he was finally arrested in 2011 .
the trailer was one of several warner bros screen at cinemacon on thursday , and the creepy two-minute clip was a highlight of the day .
johnny depp plays the notorious criminal in the film .