Jonny Evans at Macworld UK caught the Guardian outing digital radio by Apple.  The guardian quoted:

She said the greatest growth opportunities for the company's radio stations were on FM and broadband. She also announced a new tie-up with Apple enabling people to listen to digital radio on their iPhone.

As Jonny mentions, it would make sense that this digital radio would also be for the iPod touch  too.    A really amazing hacked iPhone player called iRadio has existed for many months but it is not sanctioned by Apple.

More info here:

http://musicradio.com/