'Macbeth' producer Iain Canning on casting Michael Fassbender and Marion Cotillard
Iain Canning won an Oscar for producing the 2010 Best Picture champ "The King's Speech," which chronicled a trying time in the life of King George VI in the early days of World War II. His new film "Macbeth" recounts the fabled story of a king who ruled Scotland at the start of the last millennium that inspired Shakespeare to write this tragedy four centuries later. As Canning reveals during a recent conver…