Nobody really knows anything yet. As far as I know, the original figure never really had any kind of specific backstory in the 80s (didn't he supposedly come in a plain plastic bag? If so, then there wouldn't have been any kind of bio on him).
We haven't seen the new Wun-Dar's packaging with his new bio yet. This will be the first time that the character even really has a backstory. But since it hasn't been revealed yet, nobody really knows anything at this point.