The AI is likely to be the most complex part of the game (Programming-wise) to complete, and even when it is done, it will need a lot of tweaking to get it working exactly as it should - and we'll want people to test the game to make sure it does, so you can help us with that, Sam.
We'll make an announcement on the forums and in the news section of our parent site as soon as the update that adds the AI is released, but I have no idea how far away this is. Mike was working a couple of months ago towards a christmas deadline, but things have changed since then. There have been setbacks, breakthroughs, feature additions, feature changes, and installation requirements changes. I therefore can't say how close Mike is to the goal of a working AI, so please don't ask for a release date. But trust me, you'll know as soon as it's released.
