Specifically, the Wiimote packs a $2 chip described as an “audio translator,” which CNN says “converts analog data such as human speech into a digital data stream.” That would obviously also require a microphone, one of which has already been announced, although that one (designed for use with EA’s forthcoming Boogie game) will apparently connect directly to the Wii’s USB port, not the Wiimote itself.
Nintendo undoubtedly has something up their sleeves. At $2 per chip, I am sure they are geared up to have every portion of that Wiimote utilized.
Source: Engadget