I don't think he'll come back.
I think it's a marketing ploy, just as the others have been (You know, "maybe i'll do the arnold in 08").
Ronnie knows that the minute he's officially retired, he'll join the ranks of Gaspari, Haney, Wheeler, Ray... longtime legends but on a Tier 2 in terms of marketability. BSN knows it too. They'll be hyping this "maybe he's coming back.... watch our ads to find out!" for another 18 months.