AI loves pulling back its units into the fog as a lure, especially those runaway AIs who have thousands upon thousands of reserves to waste your tiny elites.
If they are evenly matched, they will indeed retreat and try come back with something else or offer you "peace"
Noticed this too, I was baited a few times on separate occasions into moving my units forward for the easy kill as I was used to the AI pulling retreating when they are low on units.
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Welcome change.
Also, it seems AI will tailor build units according to the type of threat they can expect from your civ UU/UA
current game as America. Rushing Persia lategame with B17s, I washorribly shockedamused to find them spamming AA guns behind their infantry and artilleries.
Music is now fixed, meeting of leaders during peace time no longer skips the music as it used to (FINALLY!)
However, during war time, the music ebgins to loop, so everytime you listen to a song it starts everytime a leader comes up.. However your War Theme (of your Civ) is put in the rotation (I heard Washington's War theme, which was a VERY pleasant surprise)
The titles for leaders are now fixed. No longer will you see lord catherine of russia
I thought titles depend on your policy choices. For instance my latest policy choices are the order tree and instead of being called Lord I'm called Chairman.