One of Apple's latest trademark filings shows their home button. We've all seen the design, a little round, black button with a grey square within it.
The filing relates to goods and/or services such as the ones listed below:
Handheld mobile digital electronic devices for the sending and receiving of telephone calls, electronic mail, and other digital data, for use as a digital format audio player, and for use as a handheld computer, personal digital assistant, electronic organizer, electronic notepad, and camera
It doesn't sound like anything we don't already have in our iOS devices, but it's always fun to learn about new trademark filings. When they acquire the mark, that little button will be all theirs.