It's time for bad news, bad news, and good news. Some of you may have seen this post about the new PC patch. The bad news is that this applies also to the Mac. Specifically, what I've seen happen is that DLC Civs become swapped around. You'll want to wrap up your games. The next bad news is that the Mac is not getting the patch today. So, there will be a brief period where cross-platform play is not available. The good news is that that period should be very brief.