Nintendo has hinted that there are still Wii functions that have yet to be revealed. One of the latest rumors suggests that one of these functions is built-in microphone support.
We know that the Wiimote houses a speaker, but what if the controller also contains a microphone? And if that should be the case, could the Wiimote also double as a VoIP-supported communication device? Sure. Throw in a voice-activated phonebook and we're talkin' universal functionality (i.e. an incentive for "non-gamers" to buy in).