Shouldn't the iphone camera have ichat filter effects?

I thought I heard some place that it would be to hard to do that with the iPhone, plus what iChat and Photo Booth does is take a picture or so of the background and anything different that comes into view is green screened on top of the background. So that means that there is no magic human and pet identifier that allows you to be on the produced background. So if they do do that then you would have to hold your phone as if it were on a stand.