This through BoingBoing -- the Chinese government is apparently applying a three hour time limit to online games, with five hour rest breaks minimum between. Play too long, your attributes in-game start dropping. All the majors, including WoW, seem to be complying.
Although the question has already been raised about players hopping from game to game instead of actually, say, not playing my question is -- how will this affect gold farming? We all joke about the Chinese gold farmer, this could have a measurable effect on the viability of farming in the MMO works and subsequently the in-game economies of those worlds.
(P.S. why am I getting all these hits from the Dr. Who forums? Am I up for, like, the Golden Scarf Award or something?)