I’m always a little hesitant to go bonkers over a trailer because, like a jilted lover, I just don’t want to get burned again after emotionally investing myself in a two-minute clip. This is my state of mind with “Brothers,” the new film from Jim Sheridan (“In America”), starring Tobey Maguire (“Spider-Man”), Natalie Portman (“The Other Boleyn Girl”) and Jake Gyllenhaal (“Rendition”). My heart strings were tugged a little bit while watching this preview, but again – how much of …