Patch "a" is out and linked in the first post. It won't effect save games.
It makes the following changes:
1. Centaurs no longer require stables.
2. Kuriotates correctly work their 3rd ring.
3. Hidden Nationality units advance into the tile after combat if it is clear.
4. Cannibalize now correctly requires Combat II.
5. Fixed broken infernal and svartalfar diplomacy tags.
6. Reduced barbarian spawning on Settler, Chieftan and Warlord difficulty.
7. Added +1 Happy per military unit to Aristocracy.
8. Lair spawn chance is now modified by difficulty, from 4% per turn, to 2% for Warlord and below, 4% on Noble to Monarch, and 6% on Emperor and above.
9. Sailors Dirge spawn chance is now modified by difficulty, from 10% per turn, to 4% for Warlord and below, 8% on Noble to Monarch, and 12% on Emperor and above.
10. Sailors Dirge First Turn added to the editor, it controls the first turn that the Dirge is allowed to start spawning skeletons (defaults to 0).