According to a report over on D'toid, Valve will be showing off the new Special Infected coming to Left 4 Dead 2 at PAX.
This little zombie guy, called The Jockey, will "jump on the backs of Survivors and tear them apart from behind", while controlling the movements of the Survivor and leading them into areas where zombies are waiting to eat them, caress them, or talk politics.
Or whatever it is zombies do when they get a hold of your character. Regardless, it won't be nice.
PAX is this weekend, so stick around to find out all about it.