Not specifically for games, but here is an interesting demo on using XGen for doing long hair: [ame="http://www.youtube.com/watch?v=yBzQGgMG3dg"]Maya Monday - XGen tube groom for long hair - YouTube[/ame]
I hear there's a great pipeline for making good hair with Xgen, that now ships with Maya2015, but I have yet to see any documentation for it specifically pertaining to game hair. I'll add my question to yours, since I want to know also.