A slower paced level up system if the world has enough content to progress through without needing to rush to the endgame to see yourself immersed in the experience is the way to go, so I really hope Yoshi has crafted Eorzea in 2.0 in this kind of world, in which double experience periods would only ruin this goal, so, no, I hope no double exp periods are given or planned.

Double drop rate weekends on the other hand....