I seriously want this to be the end-all solution for running outdoors but I've got a few essential questions that weren't explicit on apple's site... the watch will have to use cellular, right? I don't see how else it will be able to utilize something like GPS unless tethering off your phone, which completely defeats the purpose of using it to run. Also, it's got no headphone input. So once again, are you still tied to your phone for music? Bluetooth seems to be lagging desperately on the headphone front.