Playing the Baldur's Gate & Icewind Dale Series, we were able to create and import our own complete voicesets. like this: http://chosenofmystra.net/forums/viewtopic.php?t=745

 

Wondering if the devs planned on allowing us to do this is a similar manner as in the past, if at all. Many thanks and best wishes to all

This would fall under modding, not an actual feature, methinks. They never announced that that would be something, and it should be easy enough just to replace the audio file in the audio folders.