When questioned about this exact issue, either Iwata or Miyamoto said that
TP is
definitely for the GameCube. He did not say, however, if it would have Revolution abilities.
It's possible that NGC's info was something along the lines of
TP being on the Revolution development list or something.
Also,
TP being a GC/Rev title makes sense, when you consider its history...
First, they delay
TP, stating they want to make it better. However, they didn't specifically state what they were improving or adding.
Just a bit later, the Rev controller is revealed with a clip of what is obviously a hint at what a future Zelda might be.
Then we get all these rumors about
TP being on Revolution, followed by the cross-over speculation, and Nintendo's firm announcement that it
will be on the GameCube.
The cross-over seems very likely.