UPDATE - I'm now thinking the info here is correct
Which basically states that Apple is using a special active diff line
driver circuit, powered by the attached USB Type A Host device (typically a PC or Mac
USB 2.0 port)
The devices which need an Authentification IC chip are those third party hardware devices which provide a direct Lighting connection and must go through the Apple mFI developer approval process.
But it would appear for most users needs, Apple is making a suitable adapter.
More info here:
Edited by Elantric - 9/27/12 at 10:56am