The Jockey

The Jockey is a new form of Special Infected that will appear in Left 4 Dead 2. It will attack Survivors from behind and will cling on to them. From there, they can control the Survivor while doing so. It appears that the Jockey has not been mutated by the infection to the extent that his mutations are physically visible. However, he can jump great distances and somehow manages to control the Survivors. His only description for now says that he wears an extremely colorful shirt, mostly red and purple, and his sound is laughter. It was first mentioned here.