DirecTV Group (DTV) said it added 658,000 subscribers in Latin America in Q4, up 12% from the year-earlier quarter, and announced a new $4 billion stock repurchase program, sending shares up 2% in early trading Thursday. Growth in Latin America has been a driver of DirecTV's stock, though shares sold off in late 2012 on speculation the satellite TV broadcaster could make a big acquisition in Brazil. Before the open Thursday, DirecTV said Q4