iPhone 5 or iPhone 4 or just a plain fake ?

A video has been doing rounds across the internet showing what looks like a white iPhone 4 with a new multitasking screen. People are claiming that it is the new iPhone 5, while some believe that it is the iPhone 4 in white. If so, then where did the new multitasking screen come from? The iOS 5? And what about the new home screen key, all white? What we believe is that there could be a refresh model of the iPhone 4 with a new iOS4 update. We cannot confirm any of the news above but we shall surely keep you updated about the new iPhone. Tell us what you think about it.