Listen carefully to the folks speaking in the background from 640min onwards.
http://www.youtube.com/watch?v=rDUw4GYzMyQ

Of course the (presumably) Nokia employee/rep. could be entirely wrong...
But there's no official output listed anywhere as far as I recall, only the fact that it does 3.5mm AV-out.

LOL sorry, I'm honestly not trying to troll!
Just happened to notice the speaking in background & figured it might be worthwhile sharing.
I almost didn't hear it at all...