I think the only thing shown will be Quan Chi and Shang Tsung making the exchanges. Shinnok and Kahn will probably never even see each other.
But regarding your credits comment, I was actually hoping Shinnok's invasion would actually happen in this game, not in the sequel; and it would come to the point where Earthrealm forces would have to fight of people like Quan Chi, Sareena, Noob Saibot, Reiko, etc. That way, we could get all of this deviation from the MK tournament out of the way in one event and go back to the tournament quickly in the sequel.