Official WoW E3 Press Release

Key features highlighted in the release are as follows:

Immense, detailed world spanning miles of terrain and featuring hundreds of familiar locations throughout the rich Warcraft universe, as well as all-new, uncharted territories.
Hundreds of quests that drive gameplay and provide countless opportunities for adventure and heroism.
Regular content updates created by an ongoing live development team that continuously designs new lands, quests, and monsters.
Thousands of items, including rare and unique weapons and armor with which to customize your character's appearance and abilities.
Numerous character classes, each with its own distinctive style of play and multiple paths for development.
A revolutionary secondary-skill system that allows players to create truly original characters with unique combinations of abilities.
Multiple races to choose from, including Night Elves, Humans, Orcs, Tauren, Dwarves, and more to be revealed.
Several personal modes of transportation, including horses, wolves, and more.
Ships, Zeppelins, and Gryphons provide quick and easy travel throughout the world.
Instanced zones create a personal combat and adventure experience for you and your companions.

You can read the complete press release here.