It has been noted on the Mac Rumors forums that in a recent update to a Developers PDF, Apple has made mention of a "touch-screen" iPod.
The update appears to have been made on the 17 October this year, it is currently unknown whether the error is a typo of "touch-wheel" or is a slip-up on Apples behalf.
You can view the PDF here.
[Update] Apple has amended the PDF to say "touch-wheel."