I don't do multiplayer either, and the change I was mostly looking forward to was the AI( and the modding possibilities). Can't really say it's been impressive thus far. If it really isn't much better in the full version, how much of an improvement can be expected from modding it?
That's about all AI is at the moment. The best AI's could probably come up with creative solutions to situations (within set paramaters), for games it's pretty much limited to 'if x happens, do z'