[plasticphyte]

For those of us Aussies that have iPhones and iTunes Radio (which launched recently here in Oz), I can confirm that playback works in the MY2013 GD i30 Premium head units.

Tested so far:
Playback through USB to Lightning cable - works
Skip forward via steering wheel control - works
Song data - works (even for the advertisements!)

You can also switch to the iTunes Radio playlists by selecting the iPad button at the bottom of the screen, and then going into the Playlists menu item. Any radio stations you've added to your phone/tablet should then appear on the screen in the playlists.

Note - you will need 3G data on your phone, or have it tethered/connected to WiFi in order for it to work when you're out and about, so data usage fees may apply. But this should be fairly obvious anyway!