Link (and all the characters in Zelda) should never have a voice. Considering Miyamoto has already said that's how its going to be, that's how its going to be.
The extend of voices we're going to have in a Zelda game is probably going to be what we've already seen with the small giggles and one word yells/affirmations. They might do something like Midna again, but I doubt they'll do it with one of the main three characters (Link/Zelda/Ganondorf).
Miyamoto has shown he thinks voices in games hardly work out and didn't like their implementation in past games he worked on such as Star Fox, F-Zero and etc. So I highly doubt we'll see it in games such as Mario, Zelda or Pikmin, etc.