Although there hasn't been an official announcement yet, we expect to see the Wii-mic by Q3. Rumors have surfaced and GoNintendo confirmed that NDA was broken -- so, yeah, about that Wii-mic. The writing was on the wall earlier this week when High School Musical was announced for the Wii. The Karaoke Revolution-esque game by Disney Interactive will use a microphone. Unless the game is using the Gamecube's mic to be stuck in on top of the Wii, that means a microphone attachment will soon be officially announced by Nintendo.

Source: Joystiq