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The new Doctrines and Tenets are being used to represent more historically accurate versions of real heresies like Catharism. The office itself can even still keep working without a holder, just at a very reduced effectiveness. Councilor jobs like Steward are now an "office" that is placed on the map instead of a person, so you don't have to re-assign it when the councilor dies. The tech system is more tied to characters than it was in CK2, but not ready to talk about it yet.
Custom religions you found can have Holy Orders. Tutorial is described as "Stellaris-like", and they've improved the ways the game can give you suggestions on what you want to be doing. Currently they don't animate to actually interact like getting into a fight. Events will feature the actual character models posed against some kind of background, and they can have props like knives, crucifixes, etc. A Western Count and a Western Duke might wear a similar style clothing, but one wears linen and one wears silk and you will be able to see that difference. In terms of physical appearance, the new DNA system can represent all ethnicities, so we probably won't see face packs again. Everyone else uses whatever is the closest match. There will be five unique graphics sets for clothes at launch: Western (European), Middle Eastern, Sub-Saharan, Indian, and Steppe.
BONUS ROUND (Stuff that didn't make it into the article):