Warcraft

Artifact Knowledge is a hidden currency gained by researching it in your Class Order Hall. You get the quest at level 110, and collecting Artifact Knowledge will help you speedily get your off-spec Artifacts maxxed out. Artifact Knowledge increases how much Artifact Power you get from any items that grant it, and each level of Artifact Knowledge gives you a percentage-based modifier to your Artifact Power.

The new wardrobe is part of the Collections screen.

World quests are the new model for max level questing.

Relics are items which are socketed into your Artifact, similar to how gems from Jewelcrafting function.

PVP Talents (or "Honor Talents") unlock at level 110.

Many cosmetic glyphs are still made by players with Inscription and can be bought and sold on the auction house.

The fundamentals of gathering Legion are the same as they've ever been.

Once you have your first Artifact and hit level 102, you'll get a quest from the same person who gave you your first Artifact quest.

I would be surprised if no one makes something like Master Planner for Class Hall missions.

After you've gone through the quest to unlock your class hall, you may find that, without the ability to hearth back, you don't know how to get back.