Coming straight from the Leipzig Games Convention floor is a brand new Left 4 Dead teaser trailer courtesy of the fine folks over at Valve. And, if you weren't aware that zombies could throw chunks of concrete through the air, then be prepared to be in utter amazement as an overly large zombie (steroids maybe?) attacks our four friends. The buff zombie is also very sweaty and reflective ... that's just a random observation.
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TUAW