Below is a small recap of what was said during the Cataclysm Preview panel, I'm still working on organizing the information to make it more readable. Pictures should be available shortly as well.
Quote from Blizzard staffGeneral
?Level cap will be 85 because developers wanted to focus on the right things: redoing Azeroth and providing more end-game content.
?A new guild advancement system will let you earn guild perks and level a guild through 20 levels with points to spend in a talent tree. You will access abilities such as cheaper repairs, less durability loss on wipes, or mass resurection.
?Phasing can now add and remove terrain based on your progress. Coasts will be progressively more flooded depending on how far you are in a storyline for example.
Path of the Titans
?Talent trees won't be extended, you will just get 5 more talent points.
?The Path of the Titans will let players follow a path (not restricted to classes), this is a new talent system with new skills and passive abilities.
?A mastery system is being added as well, a lot of talents will be reworked to be more fun. The point is to get rid of a lot of the talent skills and not make you spend all your points in a talent tree just because it gives you more damage or higher crit chance.
Archeology
?Archeology is a new secondary profession, not many details about this one but we'll probably hear more about it in future panels.
Deathwing
?Deathwing, the leader of the Black Dragonflight will be the main vilain of the expansion.
?Deathwing heard the whispers of the Old Gods after the arrival of the Burning Legion, he eventually grew very powerful and also became very very crazy.
?His plan was to catch the Alliance and Horde unaware with something so massive that it would bring up the Elemental Planes.
?The Elemental Planes were created by titans to contain the elementals, they weren't happy with this decision and some of them like Ragnaros got really angry.
New races - Worgens
?Other races were discussed for the alliance, but the developers really felt that the alliance needed a monstrous race and horde needed something fun and tiny.
?Genn Greymane closed the Greymane Wall to block the Scourge's plague. Gilneas got nervous as the Scourge progressed to the south.
?Arugal was a patriot, he called the Worgens to battle for Gilneas but eventually was surprised by how dangerous what he called down was.
?Worgens are from somewhere else ... or even someWHEN else. They have a wolverine temperament and spent a lot of time trying to contain the beast within.
?Racial - Visciousness - +1% damage.
?Racial - Dark Flight - +70% run speed for 10 seconds.
?Racial - Abberation - Duration of Curses and Diseases reduced by 15%
?Racial - Flayer - Skinning skill increased by 15.
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