When stuff will unlock in Patch 7.3 | World of Warcraft GamePlay Guides

Not everything will be available when patch 7.3 comes out. The patch opens different things over a period of 3 weeks:

First week (week 1)

The first two story chapters (Krokuun and Mac`Aree zones)
Completing different quests during this storyline unlocks World quests on parts of the zones.

Second Week (week 2)

Third zone: Anotoran Wastes unlocks and the storyline quests in that zone.
Invasion Points unlocks.
Completing different quests during this storyline unlocks World Quests on parts of the zones.

Third week (week 3)

Rest of the storyline quests unlocks.
The new dungeon: Seat of the Triumvirate unocks.
The new relic system (relic talent tree) Netherlight Crucible unlocks

First week (week 1)

Second Week (week 2)

Third week (week 3)

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