In this interview, World of Warcraft Game Director Tom Chilton talks about the hectic final months leading up to the game’s launch, crafting an MMORPG for a wide range of play styles, and the ongoing effort to improve the game through expansions and content updates.

http://www.worldofwarcraft.com/wowanniversary/interview/tomchilton.xml

Blizzard Voice Chat (Source Re: Questions Blues always dodge)
The Blizzard Voice chat is actually pretty cool, and has improved greatly since it was released. We do see it as a success. We're completely fine with players using third party voice chat programs. It was simply important to us that an option was available for those who didn't want to rely on a 3rd party voice chat program -- no matter their reasons.

Additionally, there are a great deal more players who use it than you probably realize.

Dual-Wield DPS itemization in Cataclysm (Source Re: DW Frost DKs and Cataclysm Stat Changes)
 We will be making one-handed weapons with Strength on them.

Hit in Cataclysm (Source Re: Hit rating in Cata wont be fun)
As I've said, it doesn't really work that way though. Say you need 300 hit (using arbitrary numbers here) and your tier set provides 250 hit and you get the rest from gems and jewelry. Everything's cool. Now a new patch comes out and your tier set has 230 hit. No problem. You get rid of some of the gems and jewelry. Now a new patch comes out and your tier set has 240 hit. Now you curse Blizzard every time an item drops with hit on it.

In short, later gear has more of the same stat on it. When the stats are easily capped, the larger pools become hard to work around. I compared it today to playing Tetris with really large pieces. It's hard to make the puzzle work. 

Warlock
Unstable Affliction "nerf" in the latest PTR Build (Source Re: UA NERF! (Ty again ghost))
Tooltip clarification. Move along. [...]  I will say that Unstable Affliction backlash being unaffected by resilience really feels like a bug. I don't see how it's a necessary warlock perk. 

Achievements

• All You Can Eat (10 player) - Defeat Sindragosa in 10-player mode without any member of your raid receiving more than 5 stacks of Mystic Buffet. (Up from 4 stacks)
• All You Can Eat (25 player) - Defeat Sindragosa in 25-player mode without any member of your raid receiving more than 5 stacks of Mystic Buffet. (Up from 4 stacks)

Companion Pets

• Lil'XT - Right Click to set down or pick up your Lil' XT action figure.

Items

• You can now exchange any Battleground Mark for a Commendation of Service (185 Honor).

• Death Grip now has a 8 yards minimum range.

Glyphs

• Glyph of Disease now refreshes disease durations and secondary effects of diseases. (= The Icy Talon refresh bug)

Druid
Feral

• Mangle now increases the damage of bleed effects for 1 min. (Up from 12 sec)
• Mangle (Bear) now increases the damage of bleed effects for 1 min. (Up from 12 sec)
• Mangle (Cat) now increases the damage of bleed effects for 1 min. (Up from 12 sec)

Hunter
Beast Mastery

• Ferocious Inspiration now also increases the damage of Steady Shot by 9%.

Mage
Fire

• Empowered Fire now affects Pyroblast as well.
• Torment the Weak now affects Pyroblast as well.

Priest
Items

• Item - Priest T10 Healer 4P Bonus - Increases the effect of your Renew and Power Word: Shield spells by 5%. (Old - Your Circle of Healing and Penance spells have a 20% chance to cause your next Flash Heal cast within 6 sec to reset the cooldown on your Circle of Healing and Penance spells.)

Rogue

• Slaughter from the Shadows now reduces the energy cost of your Backstab and Ambush abilities by 4/8/12/16/20. (Up from 3/6/9/12/15)
• Serrated Blades now causes your attack to ignore up to 3/6/9% of your target's Armor.

Shaman
Items

• Item - Shaman T8 Elemental 2P Bonus - Increases periodic damage done by your Flame Shock ability by 20%. (Old - The periodic damage dealt by your Flame Shock can now be critical strikes.)
• Item - Shaman T10 Elemental 4P Bonus - Your Lava Burst spell causes your Flame Shock effect on the target to deal at least two additional periodic damage ticks before expiring. (Old -     Your Lava Burst spell increases the duration of your Flame Shock effect on the target by 6 sec.)

Warlock
Affliction

• Unstable Affliction - Only one Unstable Affliction or Immolate per Warlock can be active on any one target.
• Life Tap - Now converts [ 150% of Spirit + 1490 ] health into [1490 + Spell Power * 0.5 ] mana.  (Old - [300% of Spirit + 1490] health into [1490 + Spirit * 3 Mana]

Warrior
Protection

• Revenge damage has been slightly lowered, it now deals [ 31% of AP + 1636 ] to [ 31% of AP + 1998 ] damage at max rank. Down from  [ 31% of AP + 2181 ] to [ 31% of AP + 2665 ] damage. (That's still much higher than the live version)
• Improved Revenge now Increases damage of your Revenge ability by 30/60% (up from 10/20%) and causes Revenge to strike an additional target for 50% damage.
• Vitality now increases your total Strength by 2/4/6%, Stamina by 3/6/9% and your Expertise by 2/4/6.

Arms

• Trauma now lasts 1 min, up from 15 sec.