I'm not sure if this is an issue with this patch specifically, but just started a game (Deity/Epic) and realized that AI values horses a bit too much. It's turn 130, I'm sitting on a gold income of +125/turn and currently exporting 22 horses to 5 different civilizations at 4-5g/horse/turn. I've been doing this since very early game (capital has 12 horses) and I can honestly say that my whole civilization at this point is built on top of horse export. This would be fine in general, but I feel that the AI is just blindly accepting all horse-related trades regardless of whether or not they actually need horses. Basically, any time an AI had a gold income of more than 7/turn I sold them a horse for 5g/turn and they always happily accepted.
To illustrate my point, Ethiopia currently has 10 spare horses and they are importing 6 from me for a total of 33g/turn, while their actual income is +4g/turn and has been between negative and +10g for the whole time. So during the whole game, they've never been rich enough to justify such expensive horse purchases.
For the last ~8 games, horse sales have been pretty much the only way I've been able to keep up with early game AI at Deity level, but I don't think I've ever seen AI loving horses this much.