Well, that's not exactly what they said. All they said is that TP is a Gamecube game in the first place. Zelda Wii will be capable of much more and be slightly different from what we've seen so far. This doesn't mean they'd change it into a Shooter or something. Zelda will be Zelda forever.
Oh yeah, here are 2 sources : http://zelda.wikia.com/wiki/The_Legend_of_Zelda:_Wii
and because that's just a wiki, here another article :
it says "Details are sketchy at this point, although it is known that Miyamoto previously stated that Twilight Princess was to be the end of the traditional Zelda experience, so expect something a little different this time around. With the game being developed from the ground up for Wii, we can most probably expect Wii-mote functionality to be alot more influencial on gameplay."
Don't expect any fundimental changes.