The iPod Observer (via MacBlogz) just posted what they believe to be the next model of iPhone's back side. They point out that the number on the back is a model number that doesn't currently exist and that it looks like a metallic black instead of the current plastic. Obviously this wouldn't be rocket science to Photoshop either. We'll believe it when we see it.
Updated: Macrumors has the following images which appear to be from the same series. It is getting a bit more realer.
