On Friday, Apple launched a new TV ad promoting both the iPad and iPad mini by cleverly showing both products as they might be used in a FaceTime video conference, with a man’s granddaughter playing the ukelele and singing “I’ll Be Home for Christmas,” a wistful 1943 hit for Bing Crosby written by Walter Kent and Kim Gannon (based on a poem by Buck Ram). The grandfather’s iPad shows the young lady, while her iPad mini shows her grandfather’s reaction….