It came from Steam.
Pre-ordering grants gamers not only instant access, but also the Elite Solider Pack launch bonus, providing a ‘classic’ X-Com soldier, some aesthetic armour upgrades and full colour customisation.
All PC versions of XCOM are powered with Steamworks, granting the benefits of Steam Acheivements, auto-updates, multiplayer matchmaking and cloud support.
XCOM: Enemy Unknown is available for digital pre-sale on Amazon, Gamefly, GameStop, Greenman Gaming, DL Gamer and Steam for £29.99. The game launches on 9th October in North America and 12th October in Europe and Australia for PlayStation 3, Xbox 360 and PC.