Source: Tech Crunch
quote: The Nintendo DS Headset is the official headset for the Nintendo DS. It plugs into the headset port (which is a combination of a standard 3.5mm(1/8-inch) headphone connector and a proprietary microphone connector) on the bottom of the system.
quote: The micro USB3 connector solves none of those issues because it has no analog hardware and would require a dongle that is more expensive than a simple passthrough to convert digital to analog; instead of a $29 dongle it will be a $99 dollar dongle to convert digital to analog.
quote: So even if you discount technical concerns, there are several significant technical concerns Apple has to deal with including the price of the dongles.
quote: The difference is that, if Apple uses USB, everyone would need to buy new cables, instead of a $30 dock adapter to make the new dock compatible with the old dock.