Over the weekend I completed one Imm continents game with Pericles, and started another, Imm Pangaea with Cyrus.
In the first one I've seen France having a lot of trouble with barbs. There was a barb camp at some distance to the north of Paris which must have been on continuous spawn mode, because I've seen Paris' walls and health staying reduced to zero for ages. And Catherine never had any gold surplus for trade. Nor luxuries. Her barb troubles ended only when my scout finally reached the camp and sneaked in, when it was left unguarded. But soon after, the neighbouring Australia declared on them and conquered completely.
Despite all his peaceful talks, J. Curtin seems to be quite aggressive. He went to war with pretty much everyone in the game, including me (and for such a trivial thing as innocent religious conversion of a couple of his cities

). I have somehow defended against his Diggers and Mech infantry with some musketmen and field cannons. AI never bombarded or attacked the target city directly, but it did wreck all the districts and other terrain around it, that was a real ouch.
By the way, the negative production bug is still in, you repair a district and the next building would take many turns to repair. But it is enough to sacrifice one turn on switching to something useless, such as a spearman, then the next turn switch back to repairing buildings and production is back to normal, no need even to buy anything.
I've also seen Kongo use a thermonuke on Kabul, which was somewhat in the middle of my territory.

Kongo was at war with his new neighbour Australia which was Kabul's suzerain. Lucky thing, there were at least two tiles around Kabul's city centre and my territory. I wonder, what would've happened if I had a tile within the blast radius? Would that automatically put me in war with Kongo or Kongo just wouldn't have used the thermo at all in that case? Anyway, there were a few of my trade routes running through the fallout and two or three of my traders died horribly from the exposure. Mvemba, you're such a SOB.
From the second game I can only tell, that Cyrus' ability rocks! As him, you want close neighbours who would forward settle you. The archer blitz with him is really awesome. Climb the hills and shoot all opposition on the same turn! I got so much land, I doubt I'll ever build enough builders to garden it all
And one more thing I noticed: if a suzerain of some city state declares war on me, now I can make peace with that city state immediately, on the same turn. That happened in both of my post spring-patch games. Before, it was a ten turn 'peace blocked' period. Is this a new bug or what?