Well, let me quote myself here for a change:
Based on CAD designs, hardware components, several hints, cases and recent, believable mockups we created a three-dimensional computer model. This virtual model was then used to create a very detailed, true prototype that you can hold in your own two hands.
The process to create this prototype is the same that’s used to create the iPad. The back was machined from a sold block of aluminium, which was later treated with glass pearls to get the same slightly rough touch that we already know from the iPad.
My colleagues over at giga.de/benm.at created a very real design prototype based on current rumors of how the next generation iPhone might look like. We created a 3D model which was then turned into reality. Have a look what we came up with! More photos in the article.