Black Vs White on Red

I watched a series of interviews with the creators of SJ talking about the general themes of the show. The thing that always stuck with me was the focus of "White versus Black on Red."

Obviously Aku is the black and Jack is the white. Red being a common color in the settings of their encounters and also a symbol for the emotion of their relationship.

So here's the point of my post. If Genndy and co. are sticking to this theme for the new season, then who is the guy in front of Aku in the teaser? If it's Jack, what could he be wearing?

Sorry if I'm missing something here, just can't seem to find any ideas.