See below the latest trailer to come out from the Total War team showcasing as titled "A Hero's Journey".
In the game the military structure of the army is managed slightly differently than it has been under past Total War games. You have your overall hero or general unit but in this new instalment you can have different heroes who can take control over different components of your army as they would have in real life, no army had one person in charge of it all. If your main hero dies you're in big trouble but if the hero dies that is looking after a particular area of your army it could result in all the units under that particular hero wavering. This is a new concept being trialled in this new game which we will get the chance to test it in a few months time.