What would be a good next fantasy/scifi setting for TW?

I think Final Fantasy would be neat. Like a remake of The war of the Lion in total war would be amazing. Chocobo Cavalry would be amazing.

For Sci fi, 40k is a given but how habout Battletech? Huge lore to work with and basically endless potential.

What do you think? What would be your ideal settings for non historical total war?