French Google watch blog Zorgloob have been in contact after spotting that traffic information seems to have been added to Ditu (Google Maps for China). The traffic option is absent if you look at Beijing in Google Maps but features in Ditu.
At the moment the traffic is looking good around the Bird's Nest stadium:
Google also announced today driving directions for the Google Maps Flash API. This is great news for penguin lovers as you can now show driving directions with the help of an animated penguin.