Yes tis confirmed for (contender for game of the year) mario kart:
US, February 26, 2008 - Nintendo fans still hoping that the arrival of Mario Kart Wii will herald the beginning of voice chat support on the company's home console will have to put those hopes on hold for a while. The publisher's European subsidiary confirmed in an official Mario Kart Wii posting that players will only be able to communicate with each other via text chat, and not during matches.
"You can create rooms for friends to join and even text chat while you're waiting for other racers," Nintendo of Europe revealed.
Very likely, Mario Kart Wii will support a USB keyboard to communicate -- most of the Wii Channels do this already -- but we expect the majority of gamers will use a good old-fashioned Wii remote to input messages, such as "Bozon, you suck!' and "Craig, you're terrible!" or even, "How the hell is Casamassina so damned good at this game?" (The latter message will probably take some time using the Wii remote, but the importance of the statement should not be ignored.)