One feature I would like to see make a strong appearance in Rome II is Titles and I'm not just talking about one little panel where you can give a title to a few of your generals but something more elaborate. Rome could have some awesome title and office options with the senate, but I think governorships should be taken into account as well.
Governorships could be fairly straight forward affairs where you would give one of your generals command of a province for example Sicilia, Macedonia, Syria, etc after you take it over of course. It could make expanding interesting so you have to establish the rule of law to stabilize the newly conquered province. The Governor should be able to establish and raise a militia to handle local revolts and raise and command a legion if necessary.
The senate could be dynamic where the player has to gain influence to be able to pass new laws. Influence could be gained by the use of agents to bribe or eliminate trouble senators and successful conquest. On the other hand if you are managing your faction poorly you could lose influence and even become an enemy of the state and cause a civil war.
As for passing laws it would be neat to see the senate voting on it, maybe a little video clip to make the government feel a little more lively. I always enjoyed the the senate video clip in RTW and wish it was more of a feature in the main game. Maybe even some vid clips for election for the highest office. Speaking of which I think it would awesome to have a video clip for when you convert the republic to an empire or a nice clip when you have a new faction leader.
What about the possibility of certain titles being connected to unique general models for example Pontifex Maximus, Emperor, and Kings. These guys should certainly be represented by unique models on both the battle and campaign map. I don't know about you guys but I would love to lead my Emperor in battle and have a general that looks like he could be an Emperor or King.
Here is some RTW senate footage and a pic of the offices.