Mitch Hunter's card states that he may remove a token from a fig in his LOS. (I know his fig has not been released yet but we proxy unreleased figs in our play group.) So what tokens might he remove from a fig? We (my play group) figure he can remove a Guard token but what about wound tokens? Are there other tokens he could remove?

Its any token. YOu can tell by the rest of the text "IF it is an order token ..." so obviously he is not limited. It can be a guard, order, wound or ice token.

in the official rule 1.1 version this card is mentioned.

If it is a wound token, you can withdraw one damage. I.e, if a miniature has 3 damages - Mitch can take one wound token, which in this case means the miniture has only 2 damages left.