Blizzard has updated the Shadowlands hotfix blog with tuning changes for the Legion Timewalking Mage Tower challenges, many of which we've already reported on in our Healer, Tank, and Highlord Kruul changes posts. The Mage Tower will also now be kept open until Jan 4th, and some unannounced changes will coming to enchants, Burning Crusade Heroic Dungeon gems, and Legion Timewalking trinkets.
Note that some of these changes do NOT reflect the in-game hotfixes. Read more on wowhead.com