Director Dee Rees is once again switching genres as she moves from the dramatic political thriller The Last Thing He Wanted to a new adaptation of the George Gershwin opera Porgy and Bess for MGM. [caption id="attachment_873729" align="alignright" width="300"] Image via Columbia Pictures[/caption] Deadline was the first to report Rees would be heading over to MGM to tackle Porgy and Bess. Irwin Winkler (Goodfellas, Creed) and Charlie Winkler (Creed, Rocky Balboa) will executive produce. Both Rees and the Winklers worked together to help MGM secure the rights from the Gershwin Estate. Adapted from the 1925 DuBose …