a blue tooth headset for wii is a sure possibility as stated by this website:
"Bluetooth may also provide an intriguing opportunity for system expansion. The Wii only recognizes up to 4 Wiimotes, but the Bluetooth specification allows for up to 7 Bluetooth-capable devices. That leaves three slots for other Bluetooth devices such as headsets, cell phones, or printers (which may sound strange, but would not be Nintendo’s first interaction with a printer). Whatever Nintendo has planned, using standard technologies means that future innovation will be faster and less expensive."
Hopefully the delay of SSBB would be the sole purpose of adding this new technology. ow how great wud that be.