We do not anticipate making online gameplay for Virtual Console games. In terms of voice chat... certainly our system has the capability for online voice chat, what it comes down to is finalizing the peripheral... I would not be surprised to see that capability come to this system.
And finalizing a peripheral shouldn't be much of a problem, because Nintendo could easily add a Bluetooth headset...since the Wiimote already utilizes the wireless standard.
Source: http://kotaku.com/gaming/nintendo/nintendo-wii-may-get-voice-chat-334064.php