Another iPhone video is up, this one about how to activate and sync.
-They seem to have done a great job in allowing you to activate at home yourself via iTunes, as this tends to be a long, tedious, and confusing process that was made extremely simple.
-Based on this in home activation, rumors of no removable battery, and no obvious battery door in the other demo, we may have our answer on the "will it work on other carriers" question. My guess is that the way they "locked" the iPhone was quite literal: they locked the SIM in the phone, making it non-removable. (Or at least not easily removable.)
-Synching is iPod simple, with nice touches of being able to auto-sync a Yahoo address book and have POP mail settings synched to the phone as well if the accounts are already on your computer.
-We also have the billing plan answer from the video: $59.99 for 450 minutes, $79.99 for 900 minutes, or $99.99 for 1,350 minutes. All plans include unlimited data, visual voicemail, 200 SMS messages, and the usual AT&T rollover and mobile to mobile minutes. (A little steep, but with my limited talking I could probably get away with the low plan and paying extra for an upgrade on SMS.)