He's not retiring as such. ITV lose the rights to Premiership highlights and it's the end of his contract. He will apparently be doing freelance work so could appear on BBC, ITV or anywhere. Heard it's more likely he'll go back into radio.
Brighton fan and all that, but I do think Des has had his day and should now relax and think about putting all his time and money into the Albion along with the other legends.