I would really love to see Weirwood world. Or the gobbler home world taken over by witches.
Weirwood could be like Wysteria, its own short little story arc.
Would be nice ESPECIALLY since Beatrice is the single lone character featured from Weirwood in the entire game.
Similiarily, the ninja/arabian knight cat could have her own world too, made so that the felines from that world and the canines from Marleybone could in one way or another be in direct conflict with one another.