City defense.... does it exist or will it exist in the final product?

I was finishing my game yesterday, conquering cities pretty much like any other battle. The only difference was that there was a city in the distance.

That was pretty boring actually. The AI even managed to get a stack or two behind  me and got a few cities back because I had only a few units stationed there. What I am getting at is it's pretty boring not having walls and special spells enchantaments to help protect my cities. MOM had walls and a few spells like wall of fire and you could baricade yourself behind the walls.

Is this something that will be in theg ame at some wpoitn or is this game just gonna let the cities as it?

I for one would love to see better city defense.