The roving reporter from Time Out Beijing spotted Keanu Reeves in Sanlitun this weekend. China Film Group is located here, on the third floor of Zhongyu Plaza. With a summer release looming, he is most likely there for post-production work on Man of Tai Chi.
It was reported back on July 4, 2012 by Oriental Daily that while the filming of Man of Tai Chi was almost complete, only some of the speaking (dialog) will be complete at that time. In view of that, it would appear that they could be doing the voice overs. It would be practical for Keanu to go to China to do that rather than bring all of the actors to LA.
Update: This photo was posted on Weibo. The poster said that the dubbing work on Man of Tai Chi was successfully completed and that the release would be in July. Since we do not who the poster is, I would say a July release is tentative until official word is released from the distributors.