Lionsgate has premiered a new trailer for director Jim Sheridan's Brothers, starring Natalie Portman, Tobey Maguire and Jake Gyllenhaal. In the film, opening December 4th, a decorated Marine (Maguire) goes missing overseas. His black-sheep younger brother (Gyllenhaal) cares for his wife (Portman) and children at home—with consequences that will shake the foundation of the entire family.