From what I've heard he's done, he hasn't officially announced it but I doubt(and hope) we will ever see him in a ring again. Unless he and Oscar can both agree on a weight which is extremely unlikely. He has also stated he still would like a rematch with Hopkins, but for everyone's sake let's hope that never materializes.
He was at JuanMa's first title defence in PR and he looked like Fernando Vargas(not quite as big, but very big none the less)
Yea thats the last time I saw him also, and he hasn't stated anything since, at least not publicly. The last time he said anything public was before the Pac/DLH fight where he called it a joke.