The iPod shuffle remains the same but with new hues (the colors from the new nano and touch models), while there's still no upgrade for iPod classic. The old iPod may be dead although it's still on sale and on the Apple website.
iPod nano is completely different from the previous generation model. Instead of the cute little touchscreen that it was, it now has a candybar design. It's a tall touchscreen device with a Home Button. It does not run iOS and has no app capability, of course. The icons on the main screen are circles.
It has a built in pedometer and Nike+ compatibility built-in. It has an FM tuner with DVR functionality so you can pause and rewind radio. You get 30 hours of audio on a full charge, which is the highest-capacity battery yet on an iPod.
It's available in several colors, very bland IMO, compared to some older versions and in a 16 GB capacity only, at $149.
iPod touch no longer has the same rounded-on-the-back edges. It has a more boxy design when looked at from the side. I think it's good-looking. It has a taller screen, which is the same as that on the iPhone 5. It's extremely light, at 88 grams and remarkably thin. It runs iOS 6, with Siri and whatnot. Put in 4G and it's the iPhone. As I followed the keynote live, I couldn't help but think of it as the iPhone for young teenagers.
It's available in the same bland tones as the iPod nano, but at least there's some color for the first time. On the back, there is a little button-like thing that lets you attach a wrist-strap. Hmm.
It's available for $299 (32 GB) and $399 (64 GB). There is no 16 GB, probably because Apple markets it as a gaming device and some games on iOS can be quite big in size. The previous iPod touch is also available for $199 (16 GB) and $299 (32 GB) in the same two colors.