In a similar vein to the original Left 4 Dead, you will be able to pre-order Left 4 Dead 2 at a discounted price and the ability to play a demo of the game two weeks before release. Proabably released in the demo would be the first few chapters of the first campaign, as was the case with Left 4 Dead.

In addition to the lower price and early demo access, there will also be an exclusive baseball bat ingame weapon available to people who pre-order. The game is currently un-available to pre-order on Steam, but you can in most online shops.