I'm a fan of not having everything voiced. You get to have the drama voice acting can provide in cutscenes (Skyward Sword felt hamstrung by that limitation at times) but all that extraneous fluff dialogue NPCs spout is there in text to be skipped comfortably. Do I really want to hear a shop keeper? Nah.
Can't wait to hear "I suppose I coveted that wind" 2.0 acted out in a Zelda game.
You can leap forward using X, which makes the whole climbing faster (though few players took advantage of it). There are foods that increase the speed of your movement, maybe they will also affect the climbing speed. Maybe we receive claws later on.