I think it has been said there will be no agents, but I am hoping to hear that lords can do some of the things agents were known for, like:
- Raiding camps and setting fire to their food supplies (attack units agent ability). This was done in the books.
- Chasing an army into a corner, or confusing them (block army witch hunter ability)
- Set fire to city building (Damage building)
and others. I wish they would confirm or show some of this. The only thing that sound similar is when they mentioned you could plant a spy in the enemy army.