Original story by Apple Bitch. The iphone 5 home button appeared on TVC-mall.com a Chinese supplier site under iPhone 5 replacement parts. The supplier which is located in Shenzhen, China listed the part where it had previously been absent.
With this new info you can see that not only is the button redesigned but that it is also a physical home button. Dismissing the rumors that Apple would replace this with a capacitive touch button.
This could be this first evidence of the upcoming 6th generation device due out this year.