I was pretty sure he was coming back. His off-season surgery only made sense if he was planning to come back. The Vikings must have thought they had a great opportunity to go to the Super Bowl if Favre returned, and Favre (no shrinking violet, he) must have thought the same thing. So if he is not coming back because of his ankle, as reported, it must be a pretty serious issue with the ankle. One can make the case that the Vikings will be better off without Favre (see here), but I don't find that convincing. At all. With Favre, the Vikings would be serious contenders this year. With Tarvares Jackson? Or Sage Rosenfels? Give me a break.
And yet, parts of this story don't add up. Why would he have talked to Ryan Longwell, today, without mentioning that he is retiring? (Unless Longwell is covering for him, I suppose.) Why would he send text messages to friends saying he is retiring, but not officially notify the head coach, who has to make plans for the upcoming season. (Upon further review, forget that question. It has been obvious for several years that he doesn't care about the dilemma facing his head coach as he dithers about whether to retire.)
The bottom line is that even if this is confirmed later today, we won't really know for sure until the regular season, or possibly even later. In the meantime, I agree with my daughter's reaction, which was that this is sort of sad, because we won't have the chance to get our revenge on Favre this year.