AK/CM/Prae... why?

[ZohnoReecho]

Take it easy there killer. I am taking a guess here, but what I think the OP is getting at is something along the lines of CM, Prae, and Ak. They aren't called Hard Mode or anything, they are just adjusted to give lvl 50 folks a challenge (using the term loosely). When you throw the term HM around, we think of the Primals, Scenario vs HM types. There is a sizable difference between the two, while the dungeons in scenario ramp up slightly per level. I am guessing he wants to make Lvl 50 SCENARIO difficulty to be applied to the dungeons. If so, that's not HM at all.

Yoshida: We’re finally going to release something aside from the end battle content, but the housing and PvP. I believe with this you’ll be able to grasp the full potential of this game. We’ll also expand on the battle content, we are planning to have one brand new dungeon, and also include two hard mode for existing dungeons. This isn’t simply where we are going to swap mobs inside, we’re going to change the dungeons structure, and gimmicks will also change. Difficulty level will also increase. So in total, you will be having three new dungeons.

Yes, killer.
It sounds like hard mode to me.