Guys, there will be stuff to do for every kind of player in the new raid.

Q：You've mentioned that Alexander Normal is for people to relax and enjoy the story, does that mean they'll be cleared within a day or two?
Y: /em nods.
Q. Was Hard mode made with WoW's Mythic raids in mind?
Y: We're actually calling them Heroic internally.
Q.Does that mean there'll be something even harder?
Y: Depends on the players' clear rates and requests.
Q. So Alexander was made with player clear rates in mind?
Y: Yup. Looking at the number of player clears, we also have something called Content Costs where we basically want our content to be enjoyable by more people.
Q. How many levels?
Y: 4.
Q. Will there be higher IL requirements and more gimmicks as we go up?
Y: Yes. We designed it with what players considered fun between all 3 coils.

So, based on the Q&A, we will have a "Normal/Story" mode really easy (just for the story), and a Hard Mode for the raiders.
If the Hard Mode is too easy, they will add another mode, for the hardcore raiders.

I think its good enough.