The ifixit tear-down last year seemed to suggest that there isn't an antennae feed.
http://www.ifixit.com/Teardown/iPod-Touch-4th-Generation-Teardown/3562/1
Apple has a history of deliberately not including it so i wouldn't hold your breathe.
Even if hardware support is there, apple would need to add software support.
The only modern ipod's with fm are the ipod nano 5/6, they seem to keep it limited to lower-end iPod's.