Imagine a future network that uses light to transfer data to and from your iPhone or iPad at up to 224 gigabits per second. That's not that far-fetched, and according to an article on AppleInsider this morning, it appears that the iOS 9.1 library cache file refers to "LiFiCapability", meaning that Apple could be very well experimenting with the Li-Fi wireless data protocol.
The capability declaration was discovered by Twitter user Chase Fromm and verified by AppleInsider:
Li-Fi is short for Light Fidelity and refers to a bi-directional, high speed and full networked wireless communication technology. At the present time, experimental systems are showing data rates of over 10 gigabits per second, much faster than broadband systems in current usage.