Forget all those earlier reports. Warner Bros. has found its leading man — or, rather, boy — for its upcoming movie version of J.K. Rowling’s “Harry Potter and the Sorcerer’s Stone.” As revealed yesterday on the Web site of the studio (which, like PEOPLE is owned by Time Warner), British actor Daniel Radcliffe, 11, will play the highly coveted role of the young boy wizard. Radcliffe recently portrayed young David in the BBC’s “David Copperfield. “Having seen Dan Radcliffe screen test, I don’t think (the movie’s director) Chris Columbus could have found a better Harry,” Rowling is quoted as saying on the site. Also cast are newcomers Rupert Grint, 11, and Emma Watson, 10, in the roles of Ron Weasley and Hermione Granger, Harry’s best friends at Hogwarts magicians school. Previously announced in roles for the movie are Dame Maggie Smith, who will play Harry’s professor, Minerva McGonagall, and the rotund Scottish actor Robbie Coltrane, as Hagrid, who befriends the youngster.