I'm not sure if this has been brought up, I'm sure it has, but I'm having problems finding any topics regarding single player. See, I have a problem. I hate playing with people I don't know, or don't know through another friend of mine. I would like to have a mode in which I can choose who I play with by creating a private game with another friend that I can directly invite. Or give a single player mode. I don't care if it's limited, I would like to play against a modifiable AI in which I can test the game dynamics repeatedly to see where the flaws are. I can't test theories against random people, because everyone plays differently and I can't test what I want, when I want without having more control over the environment and conditions. Until I have this type of access to the game, I'll have spent $90 so I can sit on my hands and wait for someone else to Alpha test it, because I refuse to play with random people.
Omni - we've tried to make it very clear that for alpha, and probably most of beta, that you have to connect to the servers. We will be bringing more modes online, and password protected is important. Customized AIs can't be done yet, because we're still in the process of building the AIs. But the way most people already play in a sandbox mode against 1 or more AIs (custom game, with as many slots as you want, and then immediately enter the game). More features and game modes will continue to come online, but we don't provide ETAs, because we're working on a lot of different things simultaneously.