In a recent interview Kai Huang (wang?) from RedOctane, creators of Guitar Hero 3 said there would be no online for Wii initially. It seems his words were a little misleading, there will be online play from the start, but no downloadable content. They say they're still working out how best to achieve this on the Wii.
Good news for online enthusiasts, although I'd probably be more interested in downloading extra songs.
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Wii's World is not officially affiliated with Nintendo! (but they wish we were).