Out of the box, video output is not currently enabled.
I do expect to see some video output support (like that of the 5G iPod) in a future firmware update. However, I wouldn't expect mirroring support (a la iPhone interface, Safari, Google Maps, etc) to S-Video or Composite anytime soon.
However, if you watch the Macworld Keynote from January you will see that Apple has created such a display attachment for that specific demo.