Home buttons that could be a parts for the next generation iPhone 5 have started turning up online. They are available in black and white from TVC-Mall and TrueSupplier and appear to have a different rubber gasket than the current iPhone 4S design.

It seems as if part leaks have become an honored tradition when it comes to iPhone launches. We see similar leaks when it comes to iPad and iPod touch as well. This also isn't the first time that we've seen a part supplier leak parts ahead of a launch or make them publicly available for sale.

From the pictures on their respective sites in comparison to an iPhone 4S or iPhone 4 home button, the only thing that appears to have changed is the rubber gasket and mold they're using. It doesn't give us much of a clue as to what we can expect in the way of form factor or size change. The square portion would most likely be seated completely below the frame assembly and be an unnoticeable change to users. My guess would be that Apple is just adding a bit more stability.