Hi Gary,
I think PTC can't officially support publishing office 2013 until Adobe LiveCycle supports it.
http://helpx.adobe.com/livecycle/help/livecycle-es4-supported-platforms.html#Software
I'm curious - did you ever run into this error while publishing office 2013 on your PDF worker CS165052 ? We're slated to go to Office 2013 soon and also start using PDF publishing so I'm wondering what you've experienced. I know you said it was "OK", but I'm just wondering how bad the hiccups were :-). I could delay the office 2013 rollout if it's too bad.
thanks
adam