I know the developers have stated that the game won't be fully voiced-over because of the budget, but it will have voice in some parts, mostly when a major character initiates dialogue or something similar, like the old IE games did. Of course this is reasonable and anyone can understand it.
Now; I started playing Divinity: Original Sin, another game I've backed (I believe most of you know about this game), a game with much lower budget and I have to say I loved what they've done with the voice-over.
There is no voice in any dialogue, but every other NPC talking is voiced, and voiced well. This way the game feels so much more alive. You hear the people talking to each other at the market or the harbour, or the enemies saying things before they attack you and nice stuff like that.
I think it is a great idea Obsidian can borrow and add it on top of the partial dialogue voice.