Sonic Colors (Wii) Co-Op Stages confirmed.

[09tarheel]

The most recent video of the game showed what appeared to be co-op gameplay.

Here is a link confirming and some details.

It doesn't confirm that the co-op is  what the Wi-Fi logo on the box was refering to, but if this game has a strong online co-op mode that  will make the game a lot more tempting.