There are actually several ways to play this game, not only against the CPU but others as well. There is, of course, the standard, real-time gameplay, but there is turn-based and even email play as well. I am actually really excited to give email gameplay a try soon. It is hard to get away with playing an RTS at work, but a turn-based game or an email-based game I would have no problem getting away with.
I look forward to getting more time with the polished game as my first taste was an advanced Beta copy. There is a lot of work to do, but they have done so much. Look for this to be a widely discussed game in strategy circles.