Ok, here we goooooo!
Player housing or Guild Halls, with alchemy labs, forges, etc. It would be great if it was done properly.
New Races: Ogres for The Horde, Furbolgs for the alliance.
The ability to fight while not in the driver seat of a mount.
BRING BACK TREE OF LIFE (permanent shift, not this pissy 30 sec crap).
City raiding made easier!
Up the level cap to 90.
New Hero Class: Cultist. After the Twilight Cult disbanded and was defeated (I'm going to go ahead and assume that's what's going to happen just before the new expansion) the remaining Cultists joined their respective factions again. They use rage as a resource, and their 3 trees (I dunno what they'll be called) have 1 healing, 1 magic DPS, 1 melee DPS. Also, their rage can also come from someone they assign (assign tank as their rage thing) instead of being in melee combat themselves.
Screenshots of a Tauren sitting on Anduin, he's kind of an ass.
Gnomeregarn (I probably spelled in wrong but I don't care, I don't play a gnome) restored.
The Echo Isles restored.
UNDERMINE!
An armour design system similar to DCUOs. If you have worn a bit of armour, you can make yourself appear to wear it, while still gaining the stats from your superior piece of armour. I for one looked BADASS in my level 55 armour.
Aerial Combat, if people can fly in Azeroth now they're going to fly over cities and attack us. I'd like a way to defend ourselves. Maybe a two seater mount you borrow from the city flight master, one person flys, another sits on the back and throws spells or uses a crossbow or something. The mount wears off after X amount of time, and they parachute down.
Berserker Class: Source: Something akin to focus or energy. The lighter armour they wear, the more damage they deal.
Hero Class: Archmage (only available to Humans and Blood Elves). Very powerful mage that has access to not only the top level mage powers, but also has access to a brand new set of spells that I have not come up yet.
New Professions (I do not know what they are)
Capturable cities. You get into a city, and you kill their leader, the faction has X amount of time to strike back and beat the opposing faction out of the city, or it is captured, and becomes the other factions city(NPC traders and guards and stuff come in) for either A. X amount of time, or B. Until the other faction attacks the new leader.
Example: The Horde raids Darnassus, and kill the High Priestess. The Alliance fights back but fails to kill the Horde. Darnassus is temporarily under complete horde control. The Alliance counter attacks and kills the new leader (High Lord Zug Zug the Orc or something). Darnassus is again under Alliance control (no need to wait because it's their city, also areas can be captured, I don't know what system will go in place there, but it will be badass).
People in healer spec can solo, seriously, when I was resto druid (before level 40 dual spec) I couldn't do shit by myself, changed to Boomy.
Making our own unique dances for each character.
Monkeys in the streets of Orgrimmar.
Guild Applications, officially supported by the forums. Their gear might be good but they might be noobish as all hell.
I rest my case.