While we haven't seen solid evidence of the 2019 iPhone design, the question of whether the new iPhone will use Lightning or the USB-C interface has always existed.
According to the Japanese website Macotakara, the 2019 iPhone will not only continue to use the Lightning interface, but Apple will continue to use the same 5W charger and USB-A to Lightning cable as before. If users want a shorter iPhone charging time, they still need to buy accessories, such as a 12W iPad charger.
The latest news shows that Lightning will continue to retain, and will continue to provide 5W chargers, because if an accessory is used for many years, the profits will be larger. Therefore, the new iPhone's accessory configuration may still be Lightning EarPods, Lightning to USB-A cable and 5W USB charger.
This may disappoint many people, because last fall Apple began to sell the iPad Pro series with 18W USB-C charger, many people expect this accessory to become the standard for the iPhone. As the battery usage inside the iPhone gets bigger and bigger, sticking to the same 5W charger means that most iPhone users will take longer to reach 100%.