Kuo’s investor note, as republished by Joe Rossignol of MacRumors:
We believe all three new iPhones launching in 2H17 will support fast charging by the adoption of Type-C Power Delivery technology (while still retaining the Lightning port). A key technical challenge lies with ensuring product safety and stable data transmission during a fast charge. In order to achieve that goal, we think Apple will adopt TI’s power management and Cypress’s Power Delivery chip solutions for the new iPhone models. We note the OLED version may have a faster charging speed thanks to a 2-cell L shaped battery pack design.
One of the great things about the Lightning connector is how it’s able to abstract all of this under-the-hood stuff and make it really consumer-friendly. I’m sure I’m not the only one who gets confused between the five different USB-C modes, and occasionally mixes up USB-C and USB 3.0. Lightning is just Lightning, even when it isn’t; the only thing consumers will notice about the new iPhones will be how much faster they charge.