Apple will soon allow vendors who design MFi-certified accessories to build support for an obscure but already-existent port in order to ease some of the connectivity and adapter woes associated with Lightning-based headphones. 9to5Mac reported that the company might market UAC, an intermediary in headphone cables, as “Ultra Accessory Connector” (UAC).
Citing sources at Apple, The Verge adds that UAC is an old plug you might have seen with your Nikon DSLR camera rather than a proprietary new connector type from Apple. Apple's ultimate goal with UAC, The Verge claims, is making Lightning and USB-C work better together rather than replacing them with a brand new I/O port.