Apple may have leaked a major change in 2019 iPhones in the first iOS 13 Developer Beta. The change is USB-C charging which will replace the current use of a lightning cable. In the iOS 13 Recovery Mode screen, you can clearly see that the lighting cable was replaced with a USB-C cable.
You can also note that the iTunes icon was replaced with a MacBook. This is likely due to the fact the iTunes in now dead.
Apple’s MacBook’s already use the USB-C technology to charge as well as the brand new iPad Pros equipped with FaceID. This change is likely in place in favor of an all USB-C future.