Twister dug this one up. In 1997 TheSite interviewed Mark Hamill. He mostly talked about Wing Commander and interactive movies in general. Here's an excerpt:
We learned so much while we were making Wing Commander III, even while we were having this telephone conversation, new technologies, new breakthroughs are happening. So that it's almost impossible to keep up with the pace of how this thing is growing. So, it's fascinating to me, really fascinating.
You can read the lengthy interview or listen to it in RealAudio.