We talk about this in-depth in today's podcast, which should hit iTunes soon enough.
Marianne said there is a mention on Apple's site that it does not support iPod out. We're thinking it might support music playback on speaker docks, car audio -- maybe. It's too early to tell, but that's what it sounds like..
The Lightning cables are only $19. I just ordered three of them to replace most of my old cables. I wish they had an adapter to make the Lightning cables work with the iPads so we could just get rid of all of our old cables.