[UPDATE: GoPro have released the Hero 7 Black Edition. You can find more about it here.]
Looking at the different cameras (I have silver and black editions) the “3” within Hero3 is coloured to match the cameras edition. That is the Black edition’s 3 is black and the Silver Editions 3 is silver etc. But what really makes the white, silver and black editions different to one another is what goes on inside.