;)Personally, I think it's gonna be Harry Moleman, for three reasons.
1. There's a lot of emphasis on mole people in this season.
2. In season two, the villains turned out to be the Soda Poppers. So it would make sense for Telltale to make the big bad turn out to be the most random, insignificant character they can think of.
3. Why would Skunkape choose Harry, of all molemen, to make an example out of, unless he knew that he was somehow a threat? That's never really explained.
I think he's going to turn out to be Dr. Norrington, since that's the only way I can imagine him being connected to Papierwaite and Skunkape. It's possible, though; after all, he's really good at disguising his voice.
And after all, the only people that were immune to Sammun-Mak's attempt to brainwash the planet were Max (and presumably, anyone with The Gift), molepeople, and Dr. Norrington, so it would make sense for Dr. Norrington to either be a moleman or someone with The Gift.
(I'm probably wrong, but that's currently what I'm leaning towards. I don't wanna let Telltale surprise me, so I'm considering all possibilities.)