Some off the top of my head:
Alliances to actually mean something
Mutual protection pacts
The ability to create a multiple-faction alliance
MTW system of owning a province (either you did or you didn't) Entering another province is a declaration of war
More movement points for agents - I don't want to have to wait six years for my diplomat to reach the Scythians to ask for an alliance
Battles in the city streets with rebels
The ability to hold councils with your advisors to discuss political and military strategies
More exploitation of the terrain on the campaign map
More weather effects
Tradeable goods to have a function other than just money-making
A better use for princesses
Individual units that are more able to respond to various situations on the battlefield
The STW-style record of generals though it should not have as much impact on the command as it did in STW
When civil wars occur, the other side you don't choose to back should act as a coordinated group and like another faction, not as a split group of rebels
The awesome atmospheric battlefields of STW
More interesting sieges - more options, ability to go see it on the battlefield
No suicidal or idiotic AI generals who throw their lives away (taken from another thread)
STW-style movies! I loved those!
Bookmarks