Check this out. Droid Life has a video and you can see the changed lock screen. I asked in the comments but no answer.
https://youtu.be/08e4CVP6Q8M?t=5m57s
Easiest way (root) is to go in to your file browser of choice and find the file libQvoiceActivation.so and remove it. Done. Don't even need to reboot the device. Be sure to make a copy of the file if you want Voice Mate back.