So I was looking at paladin changes (my main being a paladin and all), and some of the changes that jumped out at me were the new blessings: blessing of might now grants +10% attack power and mp5, blessing of kings grants 5% boost to all stats (expect spirit) as well as resistances. Curious, I page over to warriors to look at battle shout; that buff has now become strength + agility, like horn of winter. Mark of the wild has become identical to the new kings (5% stats + resistances).
What follows is a list of current buff categories, and whether or not they still exist, and in what form (list taken from MMO's raid comp calculator). I'm sure I've missed something in here; if you find something here that's wrong or that I missed, feel free to correct me.
-Agility & Strength: Battle Shout, Horn of Winter, Strength of Earth Totem
-Attack Power, numeric: Eliminated
-Attack Power, percentage: Abomination's Might, Blessing of Might, Trueshot Aura, Unleashed Rage
-Heroism: Heroism/Bloodlust, Time Warp (mage-all)
-Damage, percentage: Arcane Tactics (arcane empowerment, renamed), Ferocious Inspiration, Sanctified Retribution
-Damage Reduction, percentage: Eliminated
-Haste, percentage: Eliminated
-Healing received, percentage: Improved Devotion Aura
-Health: Eliminated
-Intellect: Eliminated -- Some uncertainty here; arcane intellect changed, but I can't see fel intellect so i don't know about that one yet.
-Mana, Maximum - Arcane Intellect
-Mana Regen: Blessing of Might, Mana Spring Totem
-Melee Critical Strike Chance: Honour Among Thieves, Leader of the Pack, Rampage
-Melee Haste: Improved Icy Talons, Swift Retribution, Windfury Totem
-Physical Damage Reduction: Ancestral Healing, Inspiration
-Replenishment: I won't cover this now, as I don't see any changes to existing replenishment mechanics yet, and Blizzard has strongly hinted that this mechanic will be changing.
-Spell Critical Strike Chance - Elemental Oath, Improved Shadow Form, Moonkin Form
-Spell Haste: Improved Moonkin Form, Wrath of Air Totem
-Spell Power (now 10%, not numeric): Demonic Pact, Totemic Wrath (replaces totem of wrath, works with any fire totem),
-Spirit: Eliminated
-Stamina: Commanding Shout, Power Word: Fortitude. Presumably also Blood Pact, but can't confirm.
-Stat Add: Eliminated
-Stat Multiplier + Resistance: Blessing of Kings, Mark of the Wild
DEBUFFS
-Armor, Major: Devastate/Sunder Armor, Expose Armor, Faerie Fire, Scorpid Venom (this replaces scorpid sting),
-Armor, Minor: Eliminated, but all armor debuffs here seem to have been made into major armor debuffs
-Attack Power: Eliminated, but see "physical damage reduction" below
-Bleed Damage: Hemorrhage, Mangle, Trauma
-Cast Speed Slow: Curse of Tongues, Mind-Numbing Poison, Slow, Viper Venom (this replaces viper sting),
-Critical Strike Chance Taken: Eliminated
-Healing (Renamed Wound): Furious Attacks, Improved Mind Blast, Mortal Strike, Widow Venom (hunter-all), Wound Poison
-Healing Absorb: Necrotic Strike
-Health Restore: Judgement of Light
-Mana Restore: Jugement of Wisdom
-Melee Attack Speed Slow: Icy Touch, Infected Wounds, Judgements of the Just, Thunder Clap
-Melee hit chance reduction: Eliminated
-Physical Damage Dealt Reduction (10%): Bane of Weakness, Demoralizing Roar, Demoralizing Shout, Hemorrhagic Fever (DK-blood), Vindication
-Physical Vulnerability: Blood Frenzy, Brittle Bones (DK-frost), Savage Combat
-Spell critical strike chance: Improved Scorch, Improved Shadow Bolt, Winter's Chill
-Spell/magic damage taken (now 8% it looks like): Bane of Elements, Ebon Plague, Earth and Moon, Master Poisoner
-Spell hit chance: Eliminated
Ok, my patience for this is expended right now. I'll be back later.
Edit: Added Honour Among Thieves to melee critical strike chance (thanks Heavyhanded!)
Edit2: Fixed up a few things, confirmed from Blues that "Critical Strike Chance Taken" is going away as a category.