The (very late) October 2012 Release (build 15.0.0.1036) is live: http://mfcmapi.codeplex.com.
As part of my work to get MFCMAPI and MrMAPI working well in side-by-side scenarios where both Outlook 2013 and an earlier version of Outlook are installed, I’ve added a –version switch to MrMAPI. This will help us ship builds of OCAT that work properly in these situations
Here's a change list - see the Issue Tracker on Codeplex for more details, or look at the code:
Enjoy.