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
Oh, and why not make it 32GB while you are at it?