It is better for you to wait for the iPhone 10, or may be iPhone 8? Well, those series are found! Yes they are included as references -- precisely a bogus ones -- in the iOS 5.1 Beta 2. See this image:
Of course those devices don't exist they are simply fictions. And it's not the first time Apple posing the silly references to devices has not been yet created as the ones on the image, they did too in the iOS 5.1 beta 1.