Theramore's Fall

Edit: Now confirmed that there will be a lvl 90 version of the scenario still playable after the full release of MoP.

However, it is still likely that the FoS 85 version and its rewards will be available for a limited time only. Sept. 17-24.

Possibly a placeholder, since there is already a FoS for Theramore's Fall, and its supposed to be part of the Pre-MoP event, which happens at 85 not 90.
Other possibility is that the Theramore Scenario will not be removed after launch and we can keep doing it up to 90.

This comment is amazing in retrospect, lol.

While the wording of the achievement has changed to not requiring level 90 to complete this, I am still unable to get this achievement today (as of patch 6.2).