After watching this
http://www.twitch.tv/totalwarofficial/b/572003665 some more information was revealed.
-Guard mode and formation attacks will return
-Saxons will be a playable faction (they were really highlighting on the fact that you'll play as minor factions who will start really small, so perhaps as playing as the saxons you'll have to find a new home)
-Small RPG elements for generals, in that you can customize his skill tree to suit them for specific areas such as improving their melee on horseback to improving their governorship etc.
-Different diseases will be present in-game such as smallpox, measles, TB and the early signs of the plague.
-Trading with other factions will increase the likelihood of having diseases brought over to your cities etc
-walls will be an option to build for minor settlements
Trees/vegetation can be set on fire