The "missing" icon in the iPhone commercials is really iChat.
I've said it before and i'll say it again, there are 5 missing icons not 1, open your eyes. One won't be iChat, one will be games for sure, and/or one will be a widget manager... and the others will be left open for next year when they add a coverflow file browser after leopard is released and they have an sdk and alow users to actually save files and use it like the "OSX" they're advertising it as.
That way the competition could not get a head start on the within screen camera if it's not preannounced.
Acording to your post you say apple has a patent on that soo unless you want a phone the size of "Surfaces" nobody could copy such a technique. The camera is not in the home button either. The technology isn't there, those new flat panel SED TVs that cost like $30000 use a similar manufacturing process(i would think, well maybe not), I just don't see it happening either way (surface cam or home button).
Have you looked at the specs for iChat video? 100Kbps up/down, that'd be hard to maintain (maybe on 3G which my city doesn't have anyway). They aren't going to put a wifi only app on the phone.
Can you imagine the laws that would need to be passed if video conferencing while driving was possible?? I'm already breaking the law by watching local tv stations in the front seat while talking on a cell.