The grand tactical AI in the first demo is a little simple-minded and I'm not sure if it looks at terrain when it makes the overall battle plan. It might, I really don't know.
The lower level AI always uses the terrain to its advantage.
Since the first demo there have been improvements to the AI, but I haven't seen a list of them. I've only met that AI in battle, and it does seem to be improving.
Bottom line is, I really haven't seen evidence either way. No horrible mistakes, no brilliant use of terrain. We know the AI is constantly evolving, so it's inevitable that it will eventually be in there to very good effect. The low level AI already understands terrain, so we've got terrain recognition features in place. And yes, I've used random maps, so it's not somehow specially coded.
Maybe another tester has more experience.
Hook