Originally Posted by Wow Wiki

The following is a list of highlights from BlizzCon 2009.

Level cap increased to 85.

Zones are destroyed by lava in Kalimdor and Eastern Kingdoms.

The Barrens has been split into two, and is full of canyons of lava.

Wetlands is destroyed, Ashenvale hit as well. The Maelstrom churns.

New race for the Alliance: Worgen
Classes: death knight, druid, hunter, mage, priest, rogue, warlock and warrior.

New race for the Horde: Goblins
Classes: death knight, hunter, mage, priest, rogue, shaman, warlock and warrior.

New Race / Class combinations. See the chart below. These will be available only to those who have purchased the expansion.

New monsters, quests, and zones

Several new dungeons and raids
3 new battlegrounds (including "Battle for Gilneas City" [2]) and a new Wintergrasp-like PvP zone, Tol Barad
Classic zones forever changed by the Cataclysm. The changes will be made available to all players regardless of expansion purchase.

Ability to fly anywhere due to the Azeroth revamp. The blood elf and draenei starting zones will still be instanced.

Guild advancement system, which includes guild leveling, talents, achievements, and accessories.
Revamped character progression via the Paths of the Titans, Archaeology (the new secondary profession), and Ancient glyphs.

Rated battlegrounds, an alternative way to earn arena points

Ragnaros was banished in the Molten Core, but has now returned to burn Nordrassil.

Malfurion Stormrage has returned from the Emerald Dream to help defend Hyjal.

Profession level cap raised to 525 and will be named Illustrious <Profession>.

New ability for Jewelcrafters, Engineers, Blacksmiths, Leatherworkers and Tailors called "Reforging"
Stat changes:

Haste for casters is unchanged.

Mastery is being added. Mastery will provide a bonus based on the talent tree which has the most points in it, such as armor penetration or cooldown reduction.

MP5 is being removed, all healing specs will rely on spirit for mana regeneration. Holy paladins and restoration shamans may get mana regeneration talents like Intensity and Meditation, or the 5 second rule may be removed. Spell DPS classes will no longer rely on spirit for mana regeneration, and spirit will no longer be on spell DPS gear.

Spell power is being removed from items.

Characters will gain spell power from intellect much like how they currently gain attack power from agility and strength.
Many passive talents with generic bonuses, such as increased critical strike chance, damage reduction or increased healing, and specifically those that provide bonuses to buffs and perhaps debuffs, are being removed, and each talent tree will provide passive bonuses based on the number of points invested in it.
New water rendering engine.

Originally Posted by -Spector- (Post 686176)

Worgen spelled backwards is Negrow.