This IS an iPhone, looking at the carrier/signal bars, the time placement, and the battery icon.
The only thing that is throwing me off is ;
1: The edges are awfully curvy compared to the 4(s) and the 5(s)
2: It seems much wider and much taller than the 5(s)
3: The bezels are slightly thicker than normally, again on the 5(s)
Idk just something I picked up when I was watching the video a minute ago.