Originally Posted by
Slycer
Way back when in one of the interviews, Yoshida said that 2.2 would be unique because it would have not only Leviathan hard/extreme but also Moogle extreme, and indicated that the plan moving forward would be to just have hard/extreme modes of a new primal as they added them. Of course, he may have just been undercommitting to not disappoint anyone. Either way, I'll see if I can find it.
Edit: From an old interview around December:
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For future primal battles, will more than one degree of difficulty be provided?
Yoshida: In the future, primal battles will be released at the same time. For example, in patch 2.2, we will add both the hard and extreme mode Leviathan battles to the game. We will also be adding the extreme mode King Moggle Mogg XII in patch 2.2, so there will actually be three of these battles added at once in 2.2.