What features are lost on the Lightning to 30 pin dock adapter?

The materials from Apple say that the following features are not supported on the Lightning to 30 pin dock adapter and cable: Video and iPod out.

What exactly are these features?

Lightning to 30 pin adapter and Lightning to 30 pin cable

Solution 1:

The iPod out functionality is actually a very specific feature that was added only very recently. Only a few cars actually support it, so the vast vast majority of appliances should continue to work fine.

Here's the thing, though: "iPod Out" doesn't actually mean "audio output from an iPod." It's the branding for a very specific feature for cars and remote-screen tools that was included in iOS 4, which delivered a customized iOS graphic display via the in-dash screens when the device was docked

http://www.tuaw.com/2012/09/13/lightning-30-pin-adapter-works-with-analog-audio-ipod-out-doe/

For the Video functionality, this will be coming soon - the connector is capable of it, but it most likely requires additional circuitry in the adapter to implement it.

As with the 30-pin connector, the Lightning connector supports video output; Apple told Macworld that Lightning-to-HDMI and Lightning-to-VGA cables will be available “in the coming months.”

http://www.macworld.com/article/1168555/what_apples_new_lightning_connector_means_for_you.html