Season 4 will introduce some huge gearing changes, including gear vendors that let you buy any piece of loot from the 3 dragonflight raids, and upgrade it all the way to item level 528. There are also options for transmog collecting, reputation farming bonuses, and new weekly quests.

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Timestamps -
00:00 - Huge gearing changes in Season 4
01:05 - New gear vendors
02:19 - New awakened upgrade track
04:51 - Antique Bronze Bullion currency
05:19 - Mark of Mastery & Omni token
06:35 - Weekly raid rotation
08:00 - New weekly quests
09:26 - Weekly dungeon event is harder