I can't find it online, but in this month's issue (UK - issue 237, March 2012), there's a feature on Xcom, where a PC Gamer writer gets to see the game in action.
First off, I reckon the starting number of troops is six - not four, because it mentions that you can pick up to six of your best soldiers to fight the UFO crew on the ground. Given this is a preview for PC Gamer, I don't think it's likely that they'd be showing them a late game, or even mid game mission - surely it would be an early game mission? If that's the case, six is the starting number, not four. If that is accurate, that means we can have three x two fire teams, which works for me personally.
It also appears that the 'ant farm' is also the game's menu. So if you want to look at research, you no longer click on 'research', you click on the lab and the camera 'swoops in close to show you the inside of your laboratory'. Each room functions the way the old Xcom menu system did, so to name and manage your troops, you go to the barracks, to launch interceptions, you go to the hangar and so on. Personally, I love that - it sounds as though it'll make the game immersive at all times.
The Muton has a special ability - it'beats its chest to panic the inexperienced rookie'.That's bound to annoy some people here, but I'm sure there will be a way to turn them off.'Almost instantly, one of Jake's recruits spots a couple of Sectoids. We're introduced to them by a short ingame engine cutscene'.
There's quite a lot of info in here - anyone has questions, post them and I'll try to find a relevant quote in the magazine.