Is it at all possible that these small displays are really just being developed/evaluated? I mean, it would be cool and all, but I don't think that we are there technoloicaly on terms of miniaturisation to make anything like this a success, and encompass all the features that consumers demand nowadays (wifi, navigation, tactile screens etc etc) please feel free to prove me wrong! (plus, the battery to drive such a screen would need to be large, to power it for a decent amount of time)
, lets not forget the fact as well that the iPod nano is a "cash cow" for Apple and quite possibly it's biggest selling product (in terms of units), why fix it if it ain't broke, and risk alienating your customers, case in point, the stubby nano, look how long that lasted...
My predictions
Shuffle gets a price drop and 4gigs only
Nano gets updated memory (16 and 32), wifi (for iTunes library streaming), same look, same format/configuration
iPod touch gets the same features as the iPhone and is redesigned a little bit (32,64,128)
iPod classic gets a slight re-design (slimmer maybe) and flash memory 160gigs
AirTunes plus iTunes 10 and iOS updated to reflect this (4.1)
iOS 4 for iPad
Peace.