No, there are no plans for adding in the English voices for the following reasons:
- I have no idea where the voices are even stored in the Saturn version as they don't appear to be in the ADX archive that holds the music and other audio data.
- The script would need to be resynced to work with the English Audio.
- There is no necessary dialogue that is voice only with no text to accompany it.
- The Dub voices are truly awful.