Shadowlands Update 9.0.5 - Mythic Keystone Gear is Now Upgradeable
Shadowlands Update 9.0.5 is still active in the PTR servers but Blizzard has already rolled out a change into the reward system.
Warcraft Shadowlands Shadowlands Update Mythic Keystone Gear Great Vault Mythic Keystone Mythic Keystone Dungeons
Source: dualshockers.com