What happened to the complete denial of such a feature?
It's true then. Twilight Princess is a launch title for the Revolution as a Gamecube game...
They've advertised it as a Gamecube game since it was announced.
I think it's far more likely that it
will be a Gamecube game, but since the Revolution will be reverse compatible with the Gamecube, they will probably make it sort of "dual platform". Playable on both, but you get added features for playing on the Revolution.
That way both people with a Gamecube and the Revolution can play it, but for the extra stuff, like using the remote Revolution controller and visual boosts, you'll need to play it on the Revolution.