The respected technology analyst, Ming-Chi Kuo, is on record with yet another prediction for upcoming Apple devices. This time it's the iPad Pro, which, Kuo projects, will lose the Lightning port this year. Instead, it will use USB-C - and also, possibly, an 18-watt adapter.
https://www.notebookcheck.net/Ming-Chi-Kuo-Next-iPad-Pro-will-trade-Lightning-for-USB-C.329980.0.html