The gamepad isn't going to do much for Zelda or any game, we have to remember that such amazing things that could be done with it, can't be done. the U in WiiU Stands for 'you' (funnily enough) and nintendo were very quick to let it be known that you can play the gorgeous HD games on your big TV on the gamepad itself when a family members comes in and commandeers the TV...
A lot of people are forgetting that the game pad can do that. A lot of people are basically thinking 'two screens on a home console yay, and one of them does things!' But no, because when you lose the 'hub' screen, in this case the main screen of the tv, all of those wonderful little things that gamepad was doing will be forced to disappear to allow you to play the game that used to on the tv... this will re-create the subscreen button-press-to-view, and probably a once again cluttered main screen with maps, jhearts, magic, items, rupees etc etc.
If while operating the two screens, the TV and the gamepad and we're shaking and moving the gamepad around for Link to do some amazing things then how would that work when we have to keep the screen still so we can see the darn thing?
This is the primary feature of the gamepad- to transfer the main screen on to it. It may make things easier having two screens but once a screen is taken from you, the capabilities of the gamepad are probably gonna get halved or even more than that.
So, its a bit pointless to think and wish for all the magical things it could do, because it isn't going to be able to do them all the time if it did.