There have been a few, software enabling the trackpad of older macs to use full multi-touch. The airport upgrade noted before. It's probably possible to make software to enable any remote to pair with a mac. If anything hidden features would probably new things found to be possible with firmware upgrades or apps that take advantage of things apple didn't do themselves. Any self respecting company wouldn't hide a core feature from the public only to reveal it's existence latter. That would be like selling an iPod by saying it can read note and then unlock a secret feature a few months latter that it CAN PLAY MUSIC OMFG
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Things like pressure sensitive trackpad gestures could be possible, a feature that apple has yet to tap into. Or using the leds as disco lights
Things like pressure sensitive trackpad gestures could be possible, a feature that apple has yet to tap into. Or using the leds as disco lights