Did you notice how Phil Schiller showed the iMac on Stage? He always talked about how thin it is and how incredible but he never showed the thicker part of the iMac.
Also noticed that Apple ALWAYS showed every iMac from the side on there website? Since the new iMac, there is only a 20° angle to the iMac, so you can only see the thin border, but not the thicker part behind it.
Oh, btw: have fun with your iPad mini.