This thread is for the known undocumented changes made in 1.11. This thread contains things that are not covered in the 1.11 test realm patch notes at http://www.worldofwarcraft.com…est-realm-patchnotes.html .
This is for changes that are most likely intentional, but were not covered. Thing such as bugs should not go here. Also do not use this thread as a rant about a certain change. Keep it subjective. Feel free to change to add your own observations.
EDIT: Thanks everyone for your submissions! And thanks blue for the sticky 
General
* A permanant version of Aqual Quintessence (called Eternal Quintessence) is provided after completing the Hydraxian Waterlords quest chain. This is avaliable to players who have a reputation level of Revered. See Duke Hydraxis for more information.
* When dueling, all other duelers have unique icons over there heads (skulls, diamonds, shields, etc)
* When standing there is a global cooldown of 1.5 seconds.
* Temporary weapon buffs (such as poisons, enchanting oils, sharpening stones and shaman weapon buffs) will no longer be removed when zoning. These buffs will also persist when logged out.
* Added brand new loading screens for Scarlet Monastary.
* The LookingForGroup channel is now worldwide. Players in Eastern Plaguelands can look for groups in Ironforge or Stormwind.
PvP
* New item rewards have been added for those who have achieved Rank 14 in the PvP Honor System.
* Players can no longer queue up other players with the deserter debuff for a battleground by forming a raid and having the leader in a different subgroup, and joining as a group.
Mage
* Ignite - Appears to not be "rolling". Unconfirmed, possible bug.
* Evocation - Cooldown reduced to 8 minutes.
* Cooldown on the use of a Mana Gem has been decreased to two minutes.
* Pyroblast - Cooldown removed. (Confirm?)
Warrior
* New Talent: Vitality - Increases the maximum stamina of the warrior by 2% per level at a maximum of 10% *Unintended addition, will be removed in next build*
* Talent Improved Bloodrage has been redesigned. It now increases the base rage you get from Bloodrage by 3/5 rage.
* Execute - Now has a blueish color on hit.
Items
* Zandalarian Hero Charm - Initial effect has been reduced to 200 damage and 400 healing. The effect is now reduced 25 damage and 50 healing every spellcast.
* Deathdealer Shoulder - 10 stamina removed.
* The Primal Hakkari tokens used to obtain items in the Zul'Gurub armor quests now contain a "Classes:" flag. This will make it easier to determine what classes use the item.
* Noggenfogger Elixer - Cooldown removed.
Quests
* New repeatable quests have been added to the goblin cities to help re-establish reputation with the Steamwheedle Cartel. These NPCs are representitives of the Steamwheedle Cartel so those with negative reputation can intereact with them.
Raids and Dungeons
* The Ironbark Protectors in DM West now have an Entangle Root spell that lasts for ~12 seconds.
User Interface
* Buffs that have 'charges' now display how many in the buff icon.
* Debuffs are now colored coded by type. Green border is poison, purple is a curse, light blue is magic, etc.
* A leader of a raid can put symbols on a target similar to Hunter's Mark. These are purely cosmetic and assist with the organization of a raid.
* Default UI now reports quantity of an item looted, on the loot output channel. For example, "Player received loot: [Dense Stone]x3"
* Bank bags now have a higher contrasted background than before (white stone rather than dark blue).
* Inventory/bank bags are now scaled down and take up less amount of space on the screen when opened.
* Extra game tips have been added to the loading screen.
* When right clicking a player's name in chat, the whisper option has been replaced with a target option. This option does not work if the player is not in your interest area.
* Extended action bars now show hotkey and range information just like the default action bar.
* When a GM ticket is open, an estimated wait time is now displayed.
* Several technical LUA changes (for UI mod authors): http://forums.worldofwarcraft.…3889&p=1&tmp=1#post343889
World Environment
* The hills south of where Lord Kazzak spawns have been leveled, making them climbable.
Technical
* Native support for the Logitech G15 keyboard has been added. This requires no extra software, except the latest drivers from Logitech ( http://bitbasher.net/wow/g15wow.jpg )
