Left4Dead gets a new expansion this September with "Crash Course", a whole new campaign that connects the end of No Mercy with the beginning of Death Toll. Of all the endings, No Mercy was perhaps the most ambiguous, as how far and where would the helicopter would land. The beginning to Death Toll, which is just as ambiguous, finds our four survivors before a collapsed bridge and a tunnel chock-full-o'-zombies.
While it may not give as much story as Left4Dead 2, it certainly hints at the fact that Valve isn't willing to drop development of it's first iteration. Along with the campaign will be a versus version and several survival maps full of glitches waiting to be exploited.
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