According to several eagle-eyed media sources, Apple may have leaked the existence of an upcoming touch-screen iPod. The leak comes from a sentence on Apple's developer website which says, "beginning with the touch-screen models."
The entire paragraph reads:
Linking to photos and videos is supported only for 5th generation iPods running iPod Software version 1.2 or later. All other Notes feature capabilities described in this document are supported for iPod models with display screens, beginning with the touch-screen models.
The paragraph is marked as open for editing and could be changed at any moment. You can view the entire PDF document here.