So this might have been posted, I haven't seen it, but, - The guys at Firaxis have popped on youtube a 1 hour gameplay video of Xcom - A standard mission, and a terror site. Some great commentary and simply put It looks amazing.
You missed out if you've never played the original X-COM game(s). They're quite long in the tooth these days though, so I'm really looking forward to the remake. The gameplay looks awesome - incredibly similar with a modern UI.