After some serious thought, I realized that the periods in which the Total War Games where made had a pattern to them.
Rome (new period)
Medieval 2 (sequel)
Empire (new period)
Shogun 2 (sequel)
New Total War Game TBA (new period?)
Rome 2 (sequel)
With expansions in between all of them, it seems as if CA is following a pattern of a new game than a sequal to an older one. I believe Rome 2 will be announced more in 2014. The next tw game will more likely be more modern considering the fact that it wouldnt make sense just to dump all FOTS's gameplay mechanics out (for lack of a better term). I'm thinking a victoria tw because it covers a massive ammount of time, like empire. (CA's last new period)