I may just need to call AT&T about this, but how does the early upgrade option work? I'm talking about the 399/499 price point. Say I get a black 16gb for now for 399 (currently not eligible for the 199 price) Then I sell it when the white ones come out so that I can get a white one in a month or two or whatever, will I be able to get another one for the 399 price? Or will it be full retail at 599? Which may stop me from selling the black one.