I don't imagine it's likely that there'll be a patch to change the voice, but if there isn't already an option to turn the voice off then maybe a patch to enable that option would help? Or if you like all the other voices maybe a patch to just disable the DK voice.
I thought the DK was meant to be annoying and get on your nerves? All the more reason to unlock that soul-forge! <img src="/ubbthreads/images/graemlins/evilgrin1.gif" alt="" />
I haven't got the game yet so I don't know about the voice at present.