If the rumours are true and Total War: Warhammer 40,000 is a thing, destruction could be a big thing. As is vehicle-related changes. There were also reports of a Total War: WWI from a while back, which explains some of the changes. That game was cancelled, as far as I am aware.
Today's Total War games are built on old foundations, so these changes are very welcome. TBH, Warhammer III would benefit a lot from modern upscaling/Anti-Aliasing solutions. Its stock resolution scaling is horrendous. Radeon Image Sharpening and NIS do a better job.