I have the sprint version 32gb blue. I have never done an update to S-voice. In fact i have used titanium backup to freeze it ever since I rooted the phone on day 1. I also froze the samsung store apps, but whatever... I did, however, unfreeze s-voice to check the version for the purpose of this thread.
I have the same version 4.0.8124(r1) as everyone else.
You may have updated the app center, but the s-voice app seems to have the same build you always had.
with that said....have you noticed any difference in using the app that improves the experience you were having?
as far as I have seen...its still vlingo...which, for me, is a distant second to voice command on google.
but hey, if you enjoy your s-voice, and it does what you like, then rock that $#!t and enjoy your phone.