eh... not really a small patch... since there wasn't anything (at the time) known to cause a crash, we weren't too concerned. Of course, after the fact during testing yesterday, I was horrified to have the Narwhal crashing... but anyway, it is what it is... but this will be a new full mod. However, it is (near as we can tell) fully backward compatible, just so long as you do the swap-o-roonie in port. Depending upon what you have encountered, you might get by with doing the mod change while on patrol, and I have done so successfully in three of three attempts, but I had not sunk nor encountered any enemy ships... so I would definitely recommend doing the mod change while in port in the Captain's Office.
Anyway:
42b_Others_CoastalTraffic - Airplane calls
43a_Others_CoastalTraffic - Airplane calls
44a_Others_CoastalTraffic - Airplane calls
44b_Others_CoastalTraffic - Airplane calls
EastAsiaCampaign - added waypoints for group terminations
Jap_Subs_BB - ShinanoRun
Jap_AirCover - AirPort icons
US_AirCover - AirPort icons
US_CoastalBattery - Airplane calls
US_HarborTraffic - Airplane & ship calls
US_NavalBases - Airplane & ship calls
are the campaign files we've altered, and that's it. There might be a few more campaign file changes for the next version, but those changes will likely land in one and only one file, and would not be any of the numbered layer files, so the "more traffic" mods should be safe for a while.