With PAX 09 in full swing, Valve has issued new screenshots and artwork from Left 4 Dead 2, showing off more of the zombie shooter sequel's "Dark Carnival" campaign. 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" 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 some of those new items are "being offered as a pre-sell exclusive with select retailers" and listed the "electric guitar, machete, and the American baseball bat" as examples.