Coming soon to CBS: Charlie Rose, Gayle King and a complete makeover of “The Early Show,” the network’s low-rated morning television show. The network is putting the finishing touches on a two-hour news show, expected to be announced in New York next Tuesday, that will defy the gauzy conventions of morning television. It will emphasize hard news and use a conversational approach like “Morning Joe” on MSNBC and “The View” on ABC.