NVIDIA recently put out their Hairworks Maya and Max plugins for public use and I definitely encourage people to try it. No word on an engine side implementation yet but if you're interested in testing the performance of Hairworks in Maya, here's your chance. I've played with it a little bit but haven't gotten too far. Still very impressive toolset so give it a shot if you get the chance :)
Hit the jump for a video demo and useful links to try Hairworks for yourself...
Overview of NVIDIA Hairworks:
Download page for Maya and 3DS Max plugins:
Tutorial on how to use Hairworks: