My only complaint on this article is calling the iphone 3G and 3GS a 2nd Gen industrial design from the original iPhone. I never had a 3G or 3GS, but I don't believe they look different at all (except for the back going from chrome to plastic) so wouldn't they really be the same industrial design followed by the 4 and 4S being the second industrial design? I still believe the iphone 5 will have a whole new design, but I would consider it the 3rd gen, not the 4th...
I believe the article means:
Original iPhone: 1st Industrial Design (Aluminium back, with plastic bottom)
iPhone 3G/3GS: 2nd Industrial Design (All plastic back)
iPhone 4/4S: 3rd Industrial Design (Glass sandwich design)
iPhone 2012: 4th Industrial Design (Aluminium back, with glass, longer).
There was a more drastic redesign from the 3GS to the iPhone 4. However, you cannot discount the difference between original iPhone & feels the 3G; they look & feel different (not as drastic as a jump from the 3GS to the 4, but still different).