We just got wind of the following video that shows what seems to be an iPhone 4 with a bigger screen. The phone seems to be the same size as the iPhone 4 but the screen now stretches from edge to edge with minimum bezel as those early mockups suggested.
Here's the video so you can see it for yourselves. And honestly, it
does look legit no matter how hard it is to believe a working iPhone 5 unit has escaped Apple's stringent security.
Update: All evidence leads to this video being an incredibly carefully staged fake. We noticed that when launching the two apps - Safari and the game - the guy never lifts his thumb off the icon and iOS doesn't work that way. The game level also starts without anyone touching the Touch To Start button. Then the dates on the lockscreen and on the homescreen don't match up. The guy also doesn't show the phone all around and even makes a point of hiding the home button the whole time. We bet the whole thing it's probably shot on video and then used much like that elaborate joke we did for April's Fools Day back in 2010 - pretending we've installed iOS on the HTC Hero. So what do you say?
P.S. If you are interested, that game demoed on the video is ECA Games' Rock(s) Rider. We suppose that the whole thing was created to promote it.