Patch 5.2.0c Edit
Patch 5.2.0c is the unofficial name for the patch build 16685 that came out a day after the unofficially named "Patch 5.2.0b" build 16683. There is almost no info on this patch build and there has been no official acknowledgement of the release of this patch build. This client could correspond to the March 12, 2013 slate of hotfixes. Perhaps Throne of Thunder encounter bugs are being chased, but who knows.
See also Edit