Various updates - the full patch notes can be found here: https://worldofwarcraft.com/en-gb/news/23731242/915-content-update-notes
- updates to old achievements to make them easier to get;
- changes to AoE spells/attacks to remove hard cap;
- changes to covenants to make them easier to switch between, additional rewards, etc;
- new timewalking dungeons, and Mage Tower;
- improvements to Korthia & The Maw to help speed things along;
- improvements to reporting/blocking tools.