Apple does not recommend users to open their products and it rarely happens that a product that is broken, opened, and sent for repair will receive a warranty if the user admits that it was opened or if the Apple employee notices this. Because Apple does not want users to disassemble the products, it designed more than a year ago a new set of screws for the iPhone, screws that require special screwdrivers to be unscrewed. Those screws were also implemented in Macs, now we can find special screwdrivers for them almost everywhere, so Apple thought of developing another screw model.
In the image above you have an asymmetric screw which it is speculated that Apple could implement in its future products. The image would have been published by someone who would have obtained it from Apple's design department, so we don't know how real it is. If, however, Apple will make the effort to implement this kind of screws in its devices, then it will be extremely difficult to find a screwdriver that will loosen it, but only in the months immediately following the launch.
