You can download the demo of XCOM Enemy Unknown right now on Steam. The demo allows player to experience two levels from the single-player campaign. You can see how the combat system works, in addition to the chance to get a look at the XCOM base and some of the strategic decisions you’ll have to make.
The game releases on October 9. We’ll see if this project will be able to deliver good, bad or both changes to the formula of the classic strategy series.