After watching the "arrival" trailer, the *spoilers* Breton, was turned evil and become a powerful necromancer. Was this a secret hint to being able to join molag bal? to be honest this would be amazing. I loved my evil characters in TES and the concept of being forced to be a goody goody two-shoes needing to fight the daedra instead of worshiping and fighting for them is infuriating.
I'd like to make a Breton shadow knight, fighting my kin for the bonuses given to me by molag bal, darkness enthralled around me, shadows move around me and my sadistic stare feels like a knife when I touch down on with a anchor.
To an extreme, this would turn me off the game for a bit and I think it may do the same for others.
Also this would add a beautiful and unique addition to PvP, everybodies an enemy in the base game, but in this it would be (PvP)vP the one in the bracket being the alliances. In the trailer you saw undead laying siege to Cyrodil, this could be a second hint, seeming as the evil players will be a minority are we given an extra skill tree for necromancy/general-daedra-shiz.
Also, how do you feel about daedric artefacts? should they be truly unique like the emporer or be the result of unique very tough quest, allowing for multiple people to get them.