I don't like this guy, bit of a hacker but.
1) the NDA has been lifted partially ( although it still applies here I think since this wasn't announced )
2) he is exposing existing code by hacking a way to get at it, his simulated gestures. The resizing of the safari screen has to be Apples internal code.
3) in the simulator in Xcode 6 they have a re sizeable iphone. People think this indicates a larger iPhone but that doesn't explain the resizing.
4) Apple have a new API...