Crucible of Storms Ahead of the Curve and Cutting Edge will cease being available when Azshara’s Eternal Palace opens. The Crucible of Storms Hall of Fame will lock at that point, regardless of whether it is full, and Crucible of Storms will be available for cross-realm Mythic.
We expect that Rise of Azshara’s new Essences and the increase in the power of the Heart of Azeroth will give a final boost to people who are close on Uu’nat in the two weeks prior to Azshara’s Eternal Palace opening.