If you're a sane, reasonable person who, of their own volition, chooses to pre-order Left 4 Dead 2, well, you're in luck. Because early purchasers will get early access to the game's demo.
While a multiplayer demo will be released for everyone on both 360 and PC, anyone preordering the 360 version or pre-purchasing the PC version over Steam will get in early.
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No date on either of these demos, but with the game due in November, it'll be sometime before that.