As you'll read here and here.
First the Gunslinging One gave the Lions some inside info on the Packers, then he denied it. Then ESPN - the network that usually goes ga-ga over anything Favre-related - wouldn't touch the story with a ten foot pole. Today Pro Football Talk revealed that an ESPN memo said not to report the story because they don't report inaccurate stories that they can't confirm.
Unless they're from Chris Mortensen, apparently.