Agents: We will have Spies, Diplomats, Assassins, Princesses, plus religious figures. They have mentioned priests (plus the Islamic and Pagan equivilants too I guess). Inquisitors have been mentioned too but as agents of the Pope so I am not sure how they will turn up this time.
Nothing of this is new, all those diffrent "agents" existed in the first MTW. Maybe their options and the way to handle them are diffrent though, hard to say.

Kalle