Apple is holding off on wireless charging until wireless charging is more common. Phil Schiller has said as much. You still have to plug in the charger itself.

Apple is holding off on wireless charging until wireless charging is more common. Phil Schiller has said as much. You still have to plug in the charger itself. Whereas with USB you can plug it directly into laptops and it's also offered in many other devices (monitors, car stereos, airplanes). And this avoids trying to engineer two different charging methods. Apple would still have to offer USB charging, they're not going to force all iPhone users to buy a wireless charging station, not yet.