Keroro
Dororo: Ninja Frog
AC was basically a great game, it just needs the best parts from civ3 thrown in. Bring in a resource system that influences what weapons, armour and improvements you can build in your cities, allow more factions to play on a map, update the graphics WITHOUT requiring everyone to buy a new computer to run the game. Keep the social engineering more or less as it was, and either keep the old back story, or make sure that the new one has at least as much thought given to it.
It might be a bit too much to ask, but a unit creator similar to the one in GalCiv II would fit in ACII perfectly.
It might be a bit too much to ask, but a unit creator similar to the one in GalCiv II would fit in ACII perfectly.