The site writes that the buttons appear slightly different from the round ones seen on other iOS devices.
They basically have the same design as the ones on the iPhone 4/4S, except the square piece around the button has more surface area.
“Different from iPhone 4S 4, the iPhone 5 home button is round in the centre and square outside as the pictures show. The two parts are indivisible,” TVC-Mall writes in its product description.
These home buttons suggest that the next iPhone will be a redesigned model, different from the iPhone 4 and iPhone 4S.
Images of the leaked buttons show the difference between them and the current ones.