The connector, introduced as part of a developer preview as shared by 9to5Mac, features 8 pins and measures 2.05mm by 4.85mm, thinner and smaller than existing Lightning and USB-C ports. It is said to be similar in shape and size to ultra mini USB connectors that are available in some accessories.
According to Apple's Made for iPhone specifications for the Ultra Accessory Connector (UAC), it's designed to be used with headphone cables. Accessory manufacturers will be able to develop Lightning to UAC, USB-A to UAC, and 3.5mm jack to UAC cables, connecting to a UAC port built into an accessory for charging and audio purposes.
Such a port could perhaps be built into products like Beats headphones, which currently use micro-USB for charging purposes, and it could save internal space manufacturers could use for other components.
Why Apple has developed a new port rather than encouraging manufacturers to adopt USB-C or Lightning is unknown (there are already MFi specifications for Lightning ports), and it is also unclear if Apple will allow accessories beyond headphones to use the new Ultra Accessory Connector in the future.
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