In the latest tweet by Chase Fromm, he takes a snapshot on codes which he believes Apple is currently testing Li-Fi wireless communication. Fromm found the code on the iOS9.1 firmware.
Li-Fi testing is already imminent. May appear in the next iPhone 7 according to iOS code in iOS 9.1 firmware – Chase Fromm
It is hard to imagine Apple will ship this feature with the next iPhone 7 release. It is because the technology and the device to transmit the Li-Fi is still new, but nothing is impossible for Apple.
Li-Fi is a high-speed wireless communication network. It uses light to transmit data, and the data able to move even the light is dim up the level that can not be seen by human eyes. It is 100 times faster than current Wi-Fi.
To get more information about Li-Fi, you can watch the following videos.