One of the so called reliable sources regarding leaked Apple information claims that, currently, there are three different iPhone 5 prototypes.
Out of these three models, one seams to stand out more than the others, by the fact that it is pretty similar to a regular iPhone 4, but it also has a slide-out physical keyboard.
The slide-out mechanism is pretty popular amongst smartphones, however it is pretty hard to believe that Apple is going to change the iPhone this way. And that is because the iPhone has become famous thanks to its exclusive touchscreen, and Apple made us believe that they hate buttons, of any kind.
via gev.com