Yes, I actually have something out. This is part of Fat Goblin Games' CLASSified series.
The Hussar is a rework of the Pathfinder Cavalier class for "light cavalry." The cavalier tends to be a heavy cavalry or knight archetype.
In contrast, the hussar reflects light mounted archers or saber wielders.
You can get the booklet, put together by myself and Lucus Palosaari, from RPGNow right now.
A limited version will also be in the forthcoming Call To Arms: Horses & Mules.