Well, Beach has said "historical agenda" as often as I've heard "hidden agenda" so I'd be surprised if that's true.
Okay, so Cleo will be my friend as a warmonger atop some sort of randomized agenda? Something like that?
Why do you need to know the numerical +/- of the hidden agenda?
That's... no. "Hidden", means hidden. You can uncover it with spies, why would you bother doing that if the game gives you all the info right away ?
I love how backstabbing is "immersion-breaking", but a computer telling you what a diplomatic rival thinks is not. Because backstabbings never happened historically, but everyone always knew exactly what other leaders were thinking. You might prefer full information and that's fine, but using "immersion" as your reason is nonsensical.
You have the information that each civ has a hidden agenda. If a civ denounces you even though you have a positive modifier, then that means the hidden agenda is contributing a negative modifier larger than your overall modifier, if you are only denounced if your modifier is below 0.
You don't need reliable complete information if you have some idea how the system as a whole works. Like, you can make military decisions even if there is fog of war in the enemy territory. You don't get annoyed when an enemy unit comes out of the fog because the fog implies that possibility. And if you don't want that uncertainty, uncover the fog with scouts - just like you can uncover the hidden agenda with spies.
Diplomacy could also be so different from Civ V or IV that neither the known modifiers or hidden modifiers model are relevant.
I also think there will be 1 historical agenda and 2 hidden, has it been changed to 1?