This video is screaming to me that there is something obnoxious on the top edge of the phone. It is hidden in every camera angle and we see every other edge of the phone.
Perhaps that's something they should show off in the video :)
The headphone jack would be the only thing I can think of, as when they mention it, they don't show it. The other 5 faces don't have it, so its the only remaining location for it.
Maybe they had to hide the top because this version was made before they decided to add a headphone jack back in?