It should support any Qi charger and with most cases. I'm sure there are some cases that will block it but should work. Apples own charger supports multiple devices and possibly faster charging also.
I have used Qi before and it is rather slow but convenient. Have a Qi stand that maybe will work with the new phones and a speaker with built in Qi charger.
Apples entry in the market with Qi will probably make more restaurants and public areas roll out chargers in tables and so on.
Also from a security standpoint I am happy for this. Firmware in usb chargers can hide a rootkit that keeps infecting devices and other chargers. Since many public places, planes and hotels now have usb plugs this has become more of a risk.