Here's what we know so far:
World of Warcraft - English (NA) Forums -> Cataclysm Class Preview: Paladin
New Paladin Spells
Blinding Shield (level 81): Causes damage and blinds all nearby targets. This effect might end up only damaging those facing the paladinâ€™s shield, in a manner similar to Eadric the Pure's ability Radiance in Trial of the Champion. The Holy tree will have a talent to increase the damage and critical strike chance, while the Protection tree will have a talent to make this spell instant cast. 2-second base cast time. Requires a shield.
Healing Hands (level 83): Healing Hands is a new healing spell. The paladin radiates heals from him or herself, almost like a Healing Stream Totem. It has a short range, but a long enough duration that the paladin can cast other heals while Healing Hands remains active. 15-second cooldown. 6-second duration.
Guardian of Ancient Kings (level 85): Summons a temporary guardian that looks like a winged creature of light armed with a sword. The visual is similar to that of the Resurrection spell used by the paladin in Warcraft III. The guardian has a different effect depending on the talent spec of the paladin. For Holy paladins, the guardian heals the most wounded ally in the area. For Protection paladins, the guardian absorbs some incoming damage. For Retribution paladins, it damages an enemy, similar to the death knight Gargoyle or the Nibelung staff. 3-minute cooldown. 30-second duration (this might vary depending on which guardian appears).
World of Warcraft - English (NA) Forums -> #BlizzChat Developer Chat on Twitter -- 7.16
7/16/2010 - Dual Resource System Looks like combo points
Q: What is the goal when re-designing the paladin class? How do you plan to change rotations, talents, etc?
A. All of the paladin specializations will make use of a new resource called Holy Power. Holy Power accumulates from using Crusader Strike, Holy Shock, and some other talents. Holy Power can be consumed to augment a variety of abilities, including:
An instant mana-free heal: Word of Glory
A buff to increase holy damage done: Inquisition
A massive physical melee attack for Retribution paladins: Templarâ€™s Verdict
Holy Shieldâ€™s duration is now extended by Holy Power
Divine Stormâ€™s damage is now increased by Holy Power
World of Warcraft - English (NA) Forums -> Cataclysm Class & Mastery Systems Update
7/21/2010 - NEW TALENT TREES! WoW Talent Calculator - Sigrie
Ardent Defender - Activate to reduce damage taken by 20% for 10 sec. While active, attacks which would otherwise kill you cause you to be healed for 15% of your maximum health. 3 minute cooldown. Off the GCD.
Signature abilities gained at level 10:
As to Holy Shield, it is going through rapid iteration. Our current implementation has it providing 5% block per stack of Holy Power, up to a max of 15%. So you can use Holy Power for threat, healing or mitigation depending on current circumstances. You should be able to keep the 15% block up all the time with a very small amount of effort.
Warriors get 15% block baseline, so this means the paladin has to work harder for it. Seeing as how the paladin doesn't have to maintain Demo Shout or Thunderclap's debuff, this doesn't seem too great a burden.
Paladin - Protection
Uses Holy magic to shield himself / herself and defend allies from attackers.
Touched by the Light
We are going to turn both Holy Shield and Shield Block into short cooldowns. A short cooldown is an ability that you don't save for an absolute emergency (like Shield Wall) but we also don't want it to be on such a short cooldown that it feels maintenance-y. It's a tricky number to get right, but something in the 30 sec to 1 min zone feels about right. Then you might use Holy Shield one GCD instead of SoR or you can choose to save it until the next big boss attack.
Other posts on Cataclysm tanking philosophy:
World of Warcraft - English (NA) Forums -> Please do away with faceroll AoE tanking