This article lists all undocumented changes for patch 2.4.3. All documented changes should be listed on the main article.
World[]
The first parts for Stormwind Harbor are showing up, you can find the Harbor entrance at the northern canal wall between the Park and Cathedral districts in Stormwind. <The Royal StoneCutters Guild> and various construction worker NPCs have been added to Stormwind for the Harbor. You can witness the new npcs two of which can open a chat dialog box explaining whats going on and the new construction zone between The Northern area of The Park and Cathedral Square.
Tauren Chieftains Band (L70ETC) played a Live Show within the World's End Tavern every hour on July 15th, following the release of Patch 2.4.3.
Gan'arg Analyzers are no longer referred as "Simon Unit" in the combat log.
Many staircases have been changed to a series of tiered platforms where previously they were ramps.
General[]
Landro Longshot in Booty Bay suggests that the next TCG expansion is titled "Drums of War"; this TCG expansion will include 3 new loot cards: Bear Mount, Party Grenade, Taunt Flag.
All non-combat pets have had their levels changed. Depending on the level of the area they can be obtained, their level may vary from 1 to 70. Pets from Stormwind and Orgrimmar orphanage quests are level 1, and pets from Shattrath are level 20. Netherwhelps summoned using [Netherwhelp's Collar] are level 20. [Disgusting Oozeling] are level 55. High level pets from instances and Quartermasters are level 70.
Players new to the game have better access to the tutorial system. A pop-up frame will hint them to it.
Gear swapping also cancels a wide variety of non spell actions as well. Using a mount is not canceled, but most actions with a progress bar (opening a chest, quest items with a gear cursor, etc) are canceled. Hotfixed that instead of cancelling spells you are not allowed to swap gear or move items around bags while casting most spells, but as previously, mounting is exceptional that you can do it while casting mount spells.
The animation for a Warlock's Ritual of Souls has been changed to show the soulwell falling from the sky, and upon consumption all healthstones or the limit of the soulwell's duration, it despawns in a very noticeable flourish.
Druids are no longer taken out of [Aquatic Form] when swimming to Coilfang Reservoir. There is also no more breathable area inside that big tube you are swimming in.
NPCs[]
New quest NPC Don Carlos and his White Stallion have been added just outside Gadgetzan graveyard in Tanaris. He offers [15-30D] Nice Hat... where players need to defeat his old self in the Caverns of Time within the Old Hillbrad instance.
Change to NPC's Enrage and player's Enrage-like abilities sound effect (Bloodlust sound effect) reverted from 2.4.2.
Technician Halmaha is no longer attackable by players that choose to align themselves with the Scryers, this was probably a bug to begin with, it might have been considered harassment since it involved killing a repair vendor many people, from both factions used.
An arena vendor, Griz Gutshank has been added to the Grim Guzzler.
A new NPC, the Dark Iron Brewer, can now be found in the Grim Guzzler. If you talk to him repeatedly he will pass out drunk, and drop his stein on the ground. You can loot it to get some [Dire Brew], that will turn your character into a Dark Iron dwarf for one hour.
Patch 2.4.3 (undocumented changes)
[Smuggled Mana Cell] and a few patrols, now only the patrols are there. Making this a less desirable area for farming Motes of Mana.
[Netherwhelp's Collar] are level 20. 
[Disgusting Oozeling] are level 55. High level pets from instances and Quartermasters are level 70.
[Great Brewfest Kodo] and the 
[15-30D] 
