Also provided was our first look at the new "Jockey" Boss monster, with Valve explaining that it "lets you attack lone Survivors and wrestle control of their movement away from them-into fire, off ledges, or straight into the middle of a zombie horde."

Packing "20-plus new items" (including an electric guitar and machete) and five new campaigns, Left 4 Dead 2 hits PC and Xbox 360 on November 17.

In keeping with recent retail trends, Valve noted that one particular item, "the American baseball bat," will only be offered as a "pre-sell exclusive with select retailers."