Finally, a reason to research the Harbor tech. It being a leaf tech really detracted from its viability. Now that Harbors are awesome, its leaf tech status is justified somewhat.
Also, about damages retained on City Center and Encampments "when traded", does this extend to when cities change ownership due to being conquered? I hated how they just go back to full health after one takes them. If they retain their damages post annexation, it would make for very interesting warfare where the city keeps changing hands. Still won't fix the problem with 1-turn razing though.
AI improvements are good. Melee units not attacking embarked units anymore is good. A repeatable Civic at the end of the tree is questionable, because that might force me to pick up Globalization, which obsoletes the +4 gold per trade route card. The AI improvements sound minor, but are welcome regardless.
The warmonger penalty reduction is awesome! Makes much sense too, flavor-wise.
Overall a very solid patch. They are ironing out the issues one by one, and they certainly listen to the community feedback when it comes to game balance.