All mounts now scale with riding skill - level 20 60% mounts will now move at 100% speed with epic riding.
Players can now instantly transition in Dalaran with mounts that have both a ground and flying speed without remounting.
The reward of killing a boss in a WotLK Dungeon at Heroic difficulty is 16 Justice Points.
Though not displayed in the Dungeon Finder Interface Screen, completing your first Random Lich King Heroic Dungeon each day using the Dungeon Finder will award 23 Justice Points, in addition to the 16 Justice Points earned for each boss killed.
Completing a weekly raid quest will be rewarded with 137 Justice Points.
Herbalism and Mining give XP. The higher level the char is, the lower the received XP will be.
Tiffany Cartier no longer exchanges Titanium Powder for Dalaran Jewelcrafter's Tokens; you now turn them in at Timothy Jones via a repeatable quest.
Master Riding is available from Northrend Riding trainers at a cost of 5000, allowing all flying mounts to scale to 310% speed. Characters that already have a 310% speed flying mount are given this skill automatically and free of charge. Note that reputation discounts apply to the trainers in the Northrend starting areas!
You can now activate multiple tracking abilities (Class Trainer, Auctioneer, Mailbox, etc.) simultaneously and the minimap uses appropriate icons to distinguish them from each other; however, it still uses generic yellow dots for Find Minerals, Find Herbs, and Find Fish.
Mounts and companion pets have been moved to the spellbook.
Tooltips of mobs and objects displays quest progression of partymembers when in a party and the quest has been shared.
The character screen now displays the character's talent specialization if one exists.
The background behind the character on the character screen is now greyed.
New Guild UI and cap of 1000 members have been implemented.
Mobs for a quest you are on get a mandatory name over them regardless of the user's preference setting for mob names. The preference setting is honored as soon as you have killed the required number of mobs.
There are also numerous spelling and grammar errors in talent and skill tooltips.
If you unsheathe your weapons while dancing, they no longer get re-sheathed.
If you have FPS enabled, it is now displayed on the world map (in a different position than on the main interface)
PowerPC is no longer supported
It is now impossible for Windows 98 & Windows 2000 users to install World of Warcraft (unsupported since 3.0.2, however could still play on them)
The Elemental Invasion world event is in the game files, but will presumably be activated at a later date.
Earthquakes are noticeable at various places of the world.