When I first heard about this, there were posts in the forums debating about what Total War would be next (of course, that is still going on). An idea that caught my attention was something called "China: Total War". Not going to lie here, at first, I thought this was the stupidest thing that I had ever heard. But the more I thought about it, the cooler it sounded.
Imagine Shogun 2 with more factions, larger map, far different unit variety, and the "dynasty" factor. That all together sounds like the best total war game ever, in my opinion.