Speaking at an EA event at the Tokyo Games Show, Valve has revealed a playable demo for Left 4 Dead 2 is expected on October 27, reports Joystiq. Valve has already stated a demo will precede the game's release and that there will be early demo access for preorders, but those matters are not mentioned, nor is whether the demo is coming to PC, Xbox 360, or both. Update: To be clear the story says this was announced by Valve, and not EA, as this article originally stated. Apologies for causing any confusion.