Apple announced new Apple iPod nano (G2) at the event today.

The new Apple iPod nano are apparently even thinner than the current iPod nano. The casing is all aluminum and comes in the good old iPod mini colors.
The new iPod nano will be available in 2GB, 4GB and 8GB storage configurations. The pricing is $149 for 2GB, $199 for 4GB, $249 for the 8GB nano. The available colors are black, white, green, pink and blue. Not all colors are available with all storage variations.
More details on the Apple nano product page.