- will there be taunting skils? - Yes, and they will work like every other taunting ability you know. This being said this won't be a sure fire way to keep the aggro. Once he on you there is a good chance that he will attack someone else once the taunt effect wears off unless you use other abilities to keep his attention. ZOE is designing ESO to be a tank friendly game but not a game based off a typical "threat table"
- will there be passive abbilities that allow you to get agro ? - Again there isn't a typical threat able you need to use positioning, follow up abilities. Everyone in ESO can hold their own for a limited time. Your job as the tank is to know your group mates abilities and once they've reached their limit you come in and save the day.
- will it require dps? - Again not a typical Threat System, just because someone out DPS's a tank doesn't mean they will steal the aggro. The game is designed off a asmart AI system that will cause the enemies to attack the person they consider the biggest threat at any given time, this could mean the healer who hasn't done any DPS is the biggest threat. And due to the mob mentality of the creatures if your mage is seen killing the enemies the enemies in the back might consider that person to be the biggest threat.
- will it be based on positioning? - See above
- will it be done trough some form of crowd control ? CC will play a big part, but against mean the enemies will focus directly on the person who CC'd them.