As the September 12th Apple iPhone media event approaches, new images show an interesting new look at how the rumored next-generation iPhone design compares to both an iPhone 4S and iPhone 3GS. iColorOS (via NoWhereElse) appears to have assemled exterior next-generation iPhone pieces to build these comparisons. Notice how much thinner this new iPhone design is in comparison to the iPhone 4S and iPhone 3GS. In addition, these new photos showcase how much taller the new iPhone design is in comparison to older models. More photos are after the break.