My bet is that Apple is waiting for the fancy new WiFi based wireless power solutions to come into play. It is essentially a trickle charge right now, but by the time it hits market it should have a little more power output, and phones will have a much lower power envelope, so it should not be a problem. The nice thing about it is that you can pull power so long as you are within your home (or business') WiFi signal range, which means no plates, and constant top-offs of power. Plus, one of the bigger issues is that current wireless charging requires the use of a plastic back-plate which Apple simply will not do. The new WiFi based solution will offer charging via a small strip of plastic on the device rather than a whole back of it.Naturally Apple will also introduce a new standard when they FINALLY jump on the wireless charging bandwagon. Meanwhile I've been entirely free of wires on my Nexus 2013 since, well, 2013.