Colored and Brushed Metal.
Another photo of the new iPod Nano:
And there is also specs on the official apple page for the new nano:
From the offical apple site for the new ipod:
"Completely Remastered. A thinner design. Five stylish colors. A brighter display. Up to 24 hours of battery life. Just about the only thing that hasn't changed is the name. In 2GB, 4GB, and 8GB models starting at $149, iPod nano puts up to 2,000 songs in your pocket."
Sounds pretty awesome!