Okay, the Office 2013 support at 10.1 M050 is official. TBH, I would not expect many issues at 10.1 M040.
https://support.ptc.com/appserver/cs/view/solution.jsp?source=subscription&n=CS139353
I am looking into the WVS request now. My understanding is the same as Gary's. Office 2010 should be able to open Office 2013 documents without any issues, so the publishing can stay at 2010. WVS is not my specialty, so I'll report back if there's any perceived issues.
