If past Total War titles are anything to go by, we can expect some of the following in Shogun 2:
1. Atrocious battle AI. I think CA has consistently dropped the ball on this with every game they made since Medieval 1. Promises and claims are made of a great and challenging battle AI, but it always just makes really terrible decisions in response to player maneuvers, and becomes a predictable opponent after two battles of each scenario. Raising the "AI difficulty" setting only meant giving the CPU unfair advantages.
2. No multiplayer campaign. It's been promised since Rome: Total War. 'Nuff said.
3. Terrible historical gaffes, from the embarrassing depictions of Egypt, Germany and Gaul in Rome TW, to having the St. Petersburg Winter Palace be built in Moscow in Empire TW, to including some inane, stupidly inspired soldier concepts that never debuted into history (Gaelic head hurlers, Roman battle ninjas, and freaking invisible Indian commandos). I bet we're going to see battlefield ninjas or some stupid shit like that in Shogun 2.
4. Comedic siege battles, as since Rome: Total War, they were broken. In Medieval 2, it was nearly impossible to assault a fortified city and win, due to the potency of automatically fired arrows from city walls. In Empire and Napoleon, they were impossible to defend without laughing. The fort gates would open right up and let the enemy in without them having to take the walls; the AI would bring an army that consists of 80% cavalry, which stand outside the fort looking confused until the timer runs out; soldiers that never fire off the walls when they face an enemy; soldiers that would immediately lose all fighting skill because they are on the wall; soldiers that could not find their way up or down a climbing rope.
5. It's going to be a great game.
I love you CA!