Cataclysm additions/changes in bold and underlined

Debuffs:
Armor Debuff (Major): Scorpid Venom (Hunter), Expose Armor, Sunder Armor, Fairie Fire
Bleed Damage Increase Debuff: Mangle, Trauma, Hemo, Hyenas (weaker than player debuffs)
Spell Critical Strike Chance Debuff: Improved Scorch, Winter's Chill, Improved Shadowbolt
Melee Attack Speed Slow Debuff: Icy Touch, Infected Wounds, Judgements of the Just, Thunderclap, Earth Shock (TC and ES are -20% at base now; TC got it's duration lowered to 10 seconds)
Increased Spell Damage Taken Debuff: Ebon Plaguebringer, Earth and Moon, Curse of the Elements, Master Poisoner, Wind Serpents (weaker than player debuffs)
Physical Vulnerability Debuff: Blood Frenzy, Savage Combat, Brittle Bones (Frost DK talent), Ravagers (weaker than player debuffs)
Healing Debuff: Wound Poison, Mortal Strike, Widow Venom (Hunter replaces Aimed Shot), Furious Attacks, Shadow Priest and Frost Mage thingies. All reduce to 25% less healing taken
Physical Damage Reduction Debuff: Demoralizing Roar, Curse of Weakness, Demoralizing Shout, Vindication, Hemorrhagic Fever (change from -AP to a flat -10% physical damage done)
Chance on Hit Heal Restore Buff: Judgement of Light (it got renamed, but it is the same functionality)
Cast Speed Slow: Curse of Tongues, Slow, Mind-numbing Poison, Viper Venom

Buffs:
Melee Haste Buff: Improved Icy Talons, Windfury Totem, - Will now only increase your auto-attack speed without increasining your resource gain (Energy, RP etc) except possibly Rage due to how Warriors gain it.
Melee AND Spell Critical Strike Chance Buff: Leader of the Pack (the heal is now Druid only), Rampage, Moonkin Aura, Honor among Thieves, Elemental Oath - (Melee and Spell crit buffs got merged)
Attack Power Buff (Multiplier): Abomination's Might, Trueshot Aura, Unleashed Rage, Blessing of Might
Spell Haste Buff: Wrath of Air Totem, Improved Moonkin Form, Shadow Priest talent (NYI)
Increased Spell Power Buff: Flametongue Totem, Totem of Wrath, Demonic Pact
Percentage Damage Increase: Ferocious Inspiration, Sanctified Retribution, Arcane Empowerment
Stat Multiplier Buff: Blessing of Kings, Mark of the Wild (both buffs reduced to +5% and it does not increase the Spirit stat anymore; in addition to this it now gives +resistances (+214 @82, scales with level))
Agility and Strength Buff: Strength of Earth Totem, Horn of Winter, Battle Shout
Stamina Buff: Power Word: Fortitude, Commanding Shout, Blood Pact
Intellect Buff: Arcane Intellect, Fel Intelligence (both changed to mana instead of +int)
Damage Reduction Percentage Buff: Renewed Hope, Possibly a Resto Druid talent
Physical Damage Reduction Buff: Inspiration, Ancestral Healing
1UPs: Rebirth, Soul Stone, Ankh
Major Haste Buff: Bloodlust, Magelust
Armor Buff (Flat): Stoneskin Totem, Devotion Aura (fixed to not stack anymore)
Nature Resistance: Aspect of the Wild, Resistance Totem
Shadow Resistance: Resistance Aura, Shadow Protection
Frost Resistance: Resistance Aura, Resistance Totem
Fire Resistance: Resistance Aura, Resistance Totem
Spell Pushback Reduction: Concentration Aura
Mana Restoration Buff: Innervate (now restores up to 33% of Druid's max mana (not base) to the target making it effectively useless for Ferals), Mana Tide Totem, Hymn of Hope (these should all stack with each other)

This is reasonably accurate. Nice job. :)

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Q u o t e:
Bleed Damage Increase Debuff: Mangle, Trauma, Hemo?

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Yes, Hemo.

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Q u o t e:
Critical Strike Chance Taken Debuff (All types): Heart of the Crusader, Totem of Wrath (spells only?)

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This category is going away.

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Q u o t e:
Melee Haste Buff: Improved Icy Talons, Windfury Totem, Swift Retribution

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It's actually just melee attack speed since haste provides resources for melee specs and is hence much more powerful.

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Q u o t e:
Melee AND Spell Critical Strike Chance Buff: Leader of the Pack, Rampage, Moonkin Aura, Elemental Oath (Melee and Spell crit buffs got merged)

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We might add a Subtlety buff here as well.

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Q u o t e:
Spell Haste Buff: Wrath of Air Totem (still unique?)

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Improved Moonkin Form and a not-yet-implemented Shadow talent.

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Q u o t e:
Increased Spell Power Buff: Flametongue Totem, Totem of Wrath, Demonic Pact

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Adding Fire.

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Q u o t e:
Percentage Damage Increase: Ferocious Inspiration, Sanctified Retribution, Arcane Thingy

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Arcane Empowerment.

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Q u o t e:
Damage Reduction Percentage Buff: Grace, Blessing of Sanctuary

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Did you mean Renewed Hope? Grace is priest only. Also considering adding a Resto druid talent here.

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Q u o t e:
Percentage Increase Healing Received Buff: Tree of Life (5 min CD now, so what happens here?), Improved Devotion Aura

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Goes away.

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Q u o t e:
Am i right to believe that most if not all the talents improving baseline buffs/debuffs are bound to disappear when all talent trees will be reviewed?

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Yes. Nothing should improve those buffs / debuffs except for gaining levels.

Also, we added the 4% physical vulnerability debuff (like Blood Frenzy) to Frost DKs.

We are strongly considering having Kings and Mark provide some small amount of resistance so there isn't such a delta between having resistance buffs or not.

We are also considering (though it's less solid) making Soulstones work more like Rebirth -- you could essentially stone someone after they died and let them rez themselves -- in addition to the way they work currently. That way there would be two classes with battle rez, and we could go with the model of one per fight (maybe more in 25) rather than a long duration.

Here is the raid buff / debuff design as it stands today. I did not include hunter pets or resistance auras. This is not set in stone.

Agility and Strength - DK, Shaman, Warrior
Armor -- Shaman, Paladin
10% AP -- MM Hunter, Enh Shaman, Blood DK, Paladin
Burst Haste -- Shaman, Mage
3% Damage -- BM Hunter, Arcane Mage, Ret Paladin
Health -- Lock (probably Destro), Warrior, Priest
Mana Pool -- Mage, Lock (probably Affliction)
Mana Regen -- Paladin, Shaman, Lock (probably Affliction)
Replenishment -- Shadow Priest, Frost Mage, Survival Hunter, Destro Lock, Ret Paladin
5% Crit -- Fury Warrior, Feral Druid, Subtlety Rogue, Elemental Shaman
20% Melee Attack Speed -- Shaman, Frost DK, Ret Paladin, Survival Hunter
5% Spell Haste -- Shaman, Balance Druid, Shadow Priest, Destro Lock
6% Spell Power -- Mage, Shaman
10% Spell Power -- Ele Shaman, Demo Lock, Fire Mage
5% Stats -- Paladin, Druid

12% Armor Debuff -- Warrior, Rogue, Druid, Hunter
10% Physical Damage Debuff -- Warrior, Druid (probably bear), Prot paladin, Warlock, Blood DK
30% Bleed Damage Debuff -- Arms Warrior, Feral Druid, Subtlety Rogue
30% Cast Speed Slow -- Warlock, Rogue, Arcane Mage
5% Spell Crit Chance Taken -- Fire Mage, Lock (probably Demo), possibly Frost Mage
25% Healing Taken -- Arms Warrior, Fury Warrior, Hunter, Rogue, Frost Mage, Shadow Priest
10% Melee Attack Speed Debuff -- Warrior, DK, Feral Druid, Prot Paladin
4% Physical Vulnerability -- Arms Warrior, Combat Rogue, Frost DK
8% Spell Damage Taken -- Warlock, Unholy DK, Balance Druid, Assassination Rogue