If you're an AddOn author make sure to check out the changes with 101038 in this thread sirinsidiator created.
UI Changes: General
Completing quests now has confirmation prompt if currencies being rewarded will be capped by their upper limit (most common with Event Tickets).
Fixed some issues involving monster nameplates in the base game.
Fixed an issue where UI screens wouldn't sort items properly specifically in the Chinese game client.
Fixed an issue where HUD quick wheels could end up being incorrectly visible if the keybind to bring them up was pressed at the same time a menu was opened.
Fixed a missing background highlight that appears in the Emperor Leaderboard behind your name.
Fixed a UI error that could occur when switching from keyboard to Gamepad Mode while an armory equip or save was in progress.
Updated the UI error panel to include an Error Code that can be copied and included with bug reports or forum posts, and added an option for Advanced UI Errors that contains more options.
This option is located on the Addons screen.
Added a /roll chat command that broadcasts random roll messages to group chat.
Fixed an issue where hovering over the backbar in the Armory when it is locked was not showing the proper tooltip.
Fixed an issue where ready check prompts were not showing up on some UI screens, such as at crafting stations or the Armory.
Added screen narration to several screens and corrected some narration errors.
Added an accessibility setting for toggleable quickslot wheels. When enabled, your quickslot wheel can be toggled on rather than having to hold the keybind, and each slot on the wheel has a keybind that can be used to select the slot.
Fixed an issue where the screen narration volume setting would not save between sessions.
Fixed an issue where the housing editor would not re-narrate the screen after toggling the tooltip.
Fixed issue where the Crown Store UI would scroll to the top of the page whenever a collectible was unlocked.
Fixed several instances of keybinds improperly displaying their Gamepad version when the setting to show keyboard keybinds was enabled.
The options menu of the Achievements screen now includes an option to link the achievement in chat.
Fixed a UI error that could occur when opening the Champion quick menu or entering the Champion bar while zooming out of a cluster.
Fixed an issue where you could still scroll through the Send Mail screen while the currency selector was open.
Fixed an issue where you could still scroll through the Guild Store screen while the price range selectors were open.
In the deconstruction assistant's options menu, the filters dropdown is now properly aligned with the rest of the menu.
The divider in Guild History tooltips now correctly displays on top of the tooltip background.
Fixed an issue where searching in the Guild Store sell tab would sometimes kick you out of the search box while in the middle of typing.
Fixed an issue that caused some malformed housing links to fail to at least appear as a house preview link.
Cadwell's Almanac tooltip objectives now correctly appear to the right of their bullet points.
Completed quests that are ready to turn in now correctly display the "tasks" header.
In Collections and Emotes, when assigning a collectible or emote to the quick wheel, the "assign" keybind no longer appears if you do not have a wheel slot selected.
When re-opening a store, the previously viewed tab no longer flickers before switching back to the first tab.
Target markers applied to enemy players and their summons will now only appear on their nameplate, and no longer in the compass.