I think they were unsure at first but confirmed at some point during this Early Access on twitter that the final game will be fully voice acted.
About the lack of dialogues and character interactions... That's obviously because the game is incomplete, but it's probably more than fair to wonder (and inquire) to what degree the problem will be "fixed" by the end of development.
This basically. One of the things I liked about the first one they did is that the characters interacted like a active party, currently it feels like everyone could do thier own thing and barely chime in.
Early, and all that of course :P
