The black edition of iPhone could have been seen around many places before, and it's possibly only a color variation. People in US has noticed a iPhone Black option at thier AT&T page, although AT&T explains later that it is simply a temporary placeholder. Why would they put iPhone Black instead of something else?
Full AT&T reply below,
“The reference to “iPhone Black” was simply a temporary placeholder used over the weekend for a scheduled catalog update. It was meant to temporarily distinguish the various iPhone models-4GB, 8GB and 16GB-but was never reassigned. It should be corrected on the site by now.” Brad Mays, PR for AT&T.