Yeah I am pretty sure what is in the game is all that we are going to get.
They could release a DLC to go with another wave of new unannounced figures, but I am pretty sure this game is already hitting the limits on what the current gen of consoles can do memory wise.
The DLC probably won't happen for logistical reasons, maybe if they pushed a patch down for free but I again doubt that.
They want this to be an annual franchise. So in about a year from now, you will have a whole new game and a whole new slew of Disney characters.