If you're an AddOn author make sure to check out the changes with 101039 in this thread sirinsidiator created.
UI Changes: General
Fixed an issue where the UI would display the incorrect time remaining until the "Get Me Unstuck" button would be available again.
Updated many fish icons.
Fixed an incorrect alert message that would display when attempting to withdraw from a Guild Bank with a full inventory.
Added Arcanist-related icons to the Armory.
Fixed a rare UI error that could occur when clicking a keybind in a dialog.
Stack counts on radial menus, such as quick slot wheels, are now abbreviated once the quantity reaches 1000. Once the quantity surpasses 9000, the stack count will simply show as 9k+.
Note: This also applies to the quick slot button on the ability bar.
Fixed an issue where your name on a Trial or Challenge leaderboard would not update after changing your display name.
Edit boxes will now lose focus, and not gain focus, when the game client itself is not focused.
For example, if you launch ESO and switch to another program, the Username and Password fields will no longer indicate that typing will enter text into them. (No longer share your password with all your friends thinking you're entering it in ESO!)
When laundering items in the keyboard UI, items with 0 cost will now correctly display 0 for their laundering cost.
Fixed a UI error when interacting with social lists.
Removed the ability to try and add a locked house to favorites from the right-click context in the keyboard Collections UI.
Fixed an issue where the audio for a group ready check starting would play every time a group member responded if you hadn't yet.
Fixed an issue where the interaction prompt was incorrectly greyed out if you blocked right as you sheathed your weapon to gather a node.
Updated the name of the keybinds in the various crafting UIs to be clearer about what the keybind does, especially in Gamepad Mode.
For example, "Refine Selected" is now "Refine Multiple".
Fixed an issue where the random mount options in the Collections UI would disappear if all the mounts in the category were favorited.
Fixed an issue where you could navigate through the advanced stats panel even though an attribute panel is shown.
Fixed issue where locked collectible icons were showing as white silhouettes instead of the intended greyed-out visual.
Furniture containers will now correctly be removed from your inventory after you empty them.
Vendor windows will now display an icon indicating items that cannot be sold, just like in the keyboard UI.
Help & Tutorials
Added a new help entry to explain ability terminology between direct effects, over time effects, single target effects, and area of effects.
Updated almost all existing help entries on core combat mechanics such as Roll Dodge, Block, and Break Free to extrapolate on their behaviors and use cases, to better arm those who read them with vital knowledge.
Added a new help entry on describing Off-Balance and its many behaviors, and properly called out in other help definitions such as Interrupts and Block where Off-Balance can be applied, rather than just a description of what Off-Balance is.
Updated various tutorial/help entries to reference the daily reset language instead of the incorrect 20-hour reset language.
Various currency tutorials will now only be displayed when you gain that currency instead of when there is any change to that currency (gain or lose).
Fixed a rare UI error that could occur when adding/removing a furniture item to your inventory.
Target Markers on enemy summons and combat pets will no longer appear on the compass while in PvP areas.
Target Markers are now cleared for both players and their summons both at the beginning and end of a duel.
Fixed some issues with syncing Target Markers across zones when you form a group and when you are in a group.