Brett Favre still has game. He isn't the player he was 5 years ago, but he still threw for over 4000 yards and 30 touchdowns last year. I don't see anything on espn.com, nfl.com, or packers.com, so where is this information that Favre is supposed to retire? He has talked about retirement in the past, but so far (to my knowledge), nothing has been mentioned about him leaving this year.
Edit: found this -
http://msn.foxsports.com/nfl/story/3367980
Basically, Donald Driver, one of the starting wide receivers for the Packers, said he didn't think Favre was going to return. Man I hope he stays another year.