We got word of a brand new Special Infected coming to Left 4 Dead 2 from reader Josh, which we promptly followed up with Valve to get official confirmation. Those attending PAX will be the first to witness the arrival of The Jockey, perhaps the most annoying-yet-awesome sounding Special Infected of them all.
The Jockey is a smaller zombie who jumps on the backs of Survivors and tears them apart from behind. Not only that, but he gets to control the movements of the Survivor while he's doing it, meaning that Versus Mode just got a whole lot crazier. Sounds like a helpful little guy who'll help guide the Survivors into ambushes and other desirable locations.
That's all we know so far. We'll get to see him in the flesh at PAX.