It was announced today, that the Mage tower will be active (no unlock needed) for the rest of the Legion expansion. It havent started yet and no official time is set on when it will start. My personal guess is when pre-patch comes out.
Here is the official announcement: https://us.battle.net/forums/en/wow/topic/20765127414?page=2#38
- 13 Mechagon Guides
- Get 385-425 ilvl gear in Nazjatar - Benthic Armor
- Full Mechagon Guide
- Patch 8.2 releases June 25!
- Boss Tactics Guide: Radiance of Azshara
- Boss Tactics Guide: Za´qul
- Raid Boss Guides/Tactics: Blackwater Behemoth
- Boss Tactics Guide: The Queen´s Court
- Boss Tactics Guide: Lady Ashvane
- Boss Tactics Guide: Abyssal Commander Sivara