The next generation of Apple iPhones is expected to continue using the Lightning port and a USB-A charger data and charging, instead of changing to the USB-C. Apple was involved in development the USB-C port. Almost every other current generation Apple device, including the latest iPad Pro to the Macbook and Macbook Pro feature the USB-C. However, according to tech site Macotakara, the bottom line is the cost of keeping the Lightning port on new iPhones for the next few years is said to be more profitable for Apple. Previously, Apple was believed to be opting for the switch to USB-C
USB-C is a 24-pin USB connector system, which features a two-fold rotationally-symmetrical connector. USB-C cables and connectors connect hosts to devices, replacing a variety of ports and electrical connectors including USB-A, USB-B, HDMI, and 3.5 mm audio cables and connectors.
In August 2014 the USB Type-C Specification 1.0 was published by the USB Implementers Forum (USB-IF) and was finalized. USB-C was developed about the same time as the USB 3.1 specification.
In July 2016, USB-C was adopted by the IEC as "IEC 62680-1-3".
In September 2017, USB 3.2 was released, replacing the USB 3.1 standard. Speed is the major feature upgrade utilizing existing USB 3.1 SuperSpeed and SuperSpeed+ data modes and introduces two new SuperSpeed+ transfer modes speeding beyond the USB-C connector using two-lane operation, with data rates of 10 and 20 Gbit/s (1250 and 2500 MB/s). USB-C defines the connector; the ability to deliver speed depends on the device.
Lightning is currently slightly slower than USB C 3.1.
Apple's iPhone 8, iPhone 8 Plus and iPhone X support rapid charging where batteries can go from flat to 50% in 30 minutes, but users need to purchase a USB-C charger and a USB-C to Lightning cable adapter.
See also …
www.macotakara.jp/blog/rumor/entry-36840.html (mixed English/Japanese language site)