I went CSI, with my limited skills and I present my evidence: Everyone says: The picture is in landscape and that is the reason of why there is no button. So I checked pictures in landscape and noticed that if you have 6 icons in landscape mode on the dock, you will realised that the space between the apps would be more than the picture shown if you use the app size as reference. So here a picture of a 5 icons in landscape and if you check that reflection wave on the dock you will notice that it touches close to the end of the bezel of the left app. However, in the original picture you will notice that would be close to the begin of the bezel. So I checked as well a portrait with 4 and 5 docked icons. The 4 icons one passes the app icon and we actually have a match with the 5 icons on the portrait mode and the home button should be just below the maps app. Moreover, if you would cut the picture as the original shot, only in the 5 portrait you would cut the dot index out of the frame. Probably someone already pointed out, but if not, notice the selection of the apps: Maps(Cupertino), Calendar(7th), Keynote. If someone could get a shot in the same way with the same background and apps, having 5 icons in portrait mode(maps, calendar, keynote should be the last three), would make it easier to see.