Zbrush's next release 4R2b, will include a new hair system for the sculpting tool.
"FiberMesh will enable you to easily and quickly create hair and other fibers. FiberMesh will create a fully sculptable PolyMesh 3D object.
The FiberMesh density can range from few polygons to several millions of polygons and it may also be exported, just like any other PolyMesh3D.
When you are done shaping and sculpting, Best-Preview-Render (BPR) will help you put the final shine on your creations."
The launch date for ZBrush 4R2b is scheduled for January 23th, 2012.