Klei is talking about the characters getting different skins so that there's not 10 identical Wilsons running around. This one is actually one of their concepts, though not for Woodie.
This was the first thing that ran through my head the moment I saw it.
Click the Tumblr link for the bonus panel.

T: http://theletterwsartflap.tumblr.com/post/112178320238/i-cant-be-the-only-who-thought-this-when-that