Hard to tell since their main quests are locked behind renown level. Might have all been unlocked in the beta though. Someone from the beta might be able to tell you more.
Ayes, but from what I’m told, it’s similar to Legion quest lines. Instead of classes now we have covenants.
The question is whether I should level four toons to max to see all covenants. That sounds annoying. And I don’t want to see the whole story again four times
Works for both factions, yes. It’s tied to an achievement. Once that achievement is completed by finishing the main story once it’s unlocked account wide, all servers, both factions.