As usual, we have no idea if this is the real thing, a prototype, or just a little Photoshop fakery. The most obvious difference between what Engadget saw first and what's posted here is the color on the back, but then again, why wouldn't Apple release iPhones in different colors? They've certainly done that with iPods.
None of this guarantees anything, but I will say that if I was shopping for an iPhone, the AT&T memo would be enough for me to hold off on a purchase until mid-June at least. There is an iPhone update storm coming, and the thunder and lightning seem to be getting closer together.
