Blizzard is also boosting the affect of Covenant abilities and Legendary items. This is the explanation that Blizzard gave:
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World of Warcraft Shadowlands’ 9.0.5 update
In a blog (opens in new tab), Blizzard explained that players have been running into a problem when they’re well-geared enough to not get any relevant gear from Mythic Keystone runs anymore. Instead of having to go to the Great Vault for better gear, players can now upgrade gear that they get from Mythic runs with Valor Points. These points can be earned by completing dungeons or completing daily Covenant quests. You’ll also be able to increase the item level cap for gear you find in these dungeons by beating all eight Shadowlands dungeons at certain threshold levels. For example, the first one is Mythic 5 or higher, then Mythic 10 and finally Mythic 15. The blog speaks about improving Legendary Items and Covenant class abilities based on what is being used less among players, but it doesn’t state which ones or how they’re being improved. However, 9.0.5 PTR is available to all players right now if you want to hop into the Public Test Realm.