I just posted in thread about the patch notes what I found, I might just copy-paste that whole post here as well:
I had a look at the XML files, and what I noticed is that several civs have had their 'Deceptiveness' toned down a bit:
Alexander 4 > 4
Askia 4 > 3
Augustus 7 > 6
Bismarck 7 > 7
Catherine 7 > 7
Darius 5 > 5
Elizabeth 6 > 6
Gandhi 3 > 3
G Kahn 3 > 3
H Rashid 7 > 6
Hiawatha 7 > 5
Isabella 6 > 5
Kameham 4 > 4
Montezu 7 > 7
Napoleon 7 > 7
Oda 7 > 6
Pachacuti 7 > 6
Ramesses 6 > 6
Ramkham 7 > 6
Sejong 4
Suleiman 7 > 7
G Wash 7 > 5
Wu 7 > 7
From what I understand, this 'Deceptiveness' would play a role in how likely it is they declare on you while being friendly to you.
You see the numbers have gone down slightly, 2K Greg was talking about a slightly lesser chance of backstab, and I think it's these numbers they've adjusted to establish this effect. Consider this an amateur's guess, though, because I'm no expert on what's under the hood in this game.
And err... Babylon is missing because I haven't got that DLC.
That's what I posted, and yes, you won't see much change from such slight adjustments, although, paradoxically enough, you're mentioning Washington and Hiawatha, and that's just the two that have been toned down most. But even then, going from a 7 to a 5 on a scale of 10 isn't huge, and also you need to keep in mind that the actual figure used in any game can end up two higher or lower, depending on a dice roll.