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
- New Mythic+ ilvl gear reward: +18 instead of +15
- Dragonflight Keystone Master: Season 1 reward
- The Dragonflight Glory Dungeon Achievement reward
- The Dragonflight Glory Raid Achievement reward
- Raid testing this week
- Dragonflight Beta Development Notes - Phase 6
- How to farm Artisan´s Mettle - Dragonflight Guide
- Dragon Isles Knowledge Points - Profession GUIDE
- The Winds of Wisdom 50% Experience Buff Now Live!!
- Dragonflight World Quest Rewards