Haven't really gotten to play that much yet, but I did notice the 'shy' trait now gives a bonus to learning language schemes.
That's interesting, the opposite was actually described in the patch notes - "Made Spiritual Heads of Faith more likely to accept giving gold." Maybe that is just due to low opinion due to poor cultural acceptance with the head of faith?
For sure they're eager when you're in a holy war. For the rest, I have no idea, opinion is usually on plus.