has anyone opened up this patch to see what undocumented changes have been made?
See http://www.gamesas.com/index.php?/topic/1149135-resource-difference-plugin/ in the GECK forum.
That is not a list of differences, it is an .esp that contains all the changed items. It can be examined to see what items have been changed. An expert GECK/FNVEdit user could determine if any of those changes affected a particular Mod by comparison with an existing Mod.
I suppose a list of the important or relevant changes could be made from that resource. I'm not volunteering.