According to Apple’ s press release:
“ABC, CBS, FOX & NBC Offer Incredible Lineup of Programming in Stunning HD on the iTunes Store
October 16, 2008—Apple® today announced that all four of the major networks are offering primetime programs in stunning high definition on the iTunes® Store (www.itunes.com), including viewer favorites “Grey’s Anatomy” and “Lost” from ABC, “CSI” and “CSI: Miami” from CBS, “Bones” and “Prison Break” airing on FOX, and “Heroes” and “The Office” from NBC Universal. The iTunes Store is the world’s most popular online TV store with over 200 million TV episodes sold, including more than one million HD episodes purchased since the launch of HD programming on iTunes last month.”
Read the whole release HERE