So you don't think it's a problem that a regular iPhone 4 case doesn't fit the white model. Ok.
I'll believe that when I see it first hand. I think this is fake.
1mm is more than 10% of the thickness of the iphone 4. Do you really think that white iphone is 10% thicker than the black one? Even with the white iphone tipped in that picture to make it look thicker, it isn't 10% thicker.
But yes if it were really true it would be a problem.