Vikings head coach Brad Childress is meeting with the media at Vikings training camp in Mankato; we are of course indebted to Judd Zulgad of the greatest newspaper in the world, the Star Tribune, for live-tweeting it.
Zulgad reports that every player denied any knowledge of Favre's decision one way or the other. He also reports that Childress claims to have not heard of any decision, and that the coach "wouldn't be surprised" no matter which way the story goes. The coach says he's talked to Favre in the last 24 hours and hasn't heard anything.
You can thus translate this story one of two ways, at this point:
Frankly, the second seems much more likely to me, but we shall see.