China Times reports that the 2018 iPhones may feature faster and more efficient wireless charging.
The report states:
Since high power and high efficiency are the trend of wireless charging, it is expected that at least one of the three iPhones in 2018 will abandon the FPC to adopt a copper coil solution to achieve the above goal, and because the copper wire coil resistance is small. It can also offset the thermal effects generated by the increase in power.
When adopting the 'copper coil solution', Apple would be able to increase the power threshold that iPhones can safely handle via wireless charging.