Patch 2.4.3 and You

Patch day! What's important and applies to you as a Retribution Paladin?

• Dispel effects will no longer attempt to remove effects that have 100% dispel resistance. This means that if you enjoy PvP'ing with a 0/20/41 spec that includes 2/2 Stoicism and 3/3 Sanctified Seals, you might want to consider dropping to 2/3 Sanctified Seals. Why? 2/2 Stoicism + 2/3 Sanctified Seals grants 96% dispel resistance for your seals, which means they will still be eligible dispel targets but will have extremely high resist rates. The alternative would be to have your seals be ignored by dispel effects and have Purge start hacking away at your Blessing of Freedom, which only has 30% resistance.
• Equipping an item will now cancel any spell cast currently in progress. The implications of this change applies to libram swapping, if you swap gear for heals. You must swap gear in and wait for the GCD to complete before starting the heal to gain the effects of the gear. Until today, it was possible to swap a healing mace/shield/libram on at the last second before a heal completed and gain the effects.
• When a stun wears off, the creature that was stunned will prefer the last target with the highest threat, versus the current target. Now when you do an instance, you won't need to worry about the tank complaining when you Hammer of Justice something while he's building a threat lead! Or not really, since if the tank is rage-based, he'll still need to get hit to generate rage to build threat, so keep laying off the early stuns.
• Cheat Death: This talent has been rebalanced significantly. Killing blows are no longer 100% absorbed. If the Rogue is below 10% health, the killing blow is still completely absorbed; if the Rogue is over 10% health, enough damage will be absorbed to reduce the Rogue's health down to 10%. For the following 3 seconds, damage is not always reduced by 90%; it is now reduced by a maximum of 90%, depending on how much resilience the Rogue has. The damage reduction will be four times the damage reduction resilience causes against critical strikes.
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  Sinister Calling now increases damage to Backstab and Hemorrhage by 1/2/3/4/5% (down from 2/4/6/8/10%.). Rogues will now be semi-spikable in PvP, and will do less damage as they will need to wear more resilience and had their Hemo hamstrung. If you manage to catch 'em with their pants down (read: without Evasion active), you might, just might, spike their leathery behinds down with some well-timed random crits 'n procs. Rejoice!
• Curse of Shadows: This spell has been removed.
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  Curse of Elements: This spell now applies to Arcane and Shadow damage, as well as Frost and Fire. Minor change for us, but this means that in raids, we should see Curse of Recklessness on bosses more often with less warlocks in the raid. Before, depending on raid make-up, Shadows and Elements might have been the preferred curses before Recklessness. Now, there's a one-size-fits-all curse for all the casters. For those not in the know, Curse of Recklessness reduces the armor of the target, which in a raid environment gets stacked with other armor-reducing debuffs. If you didn't all ready, start including it in your armor penetration theorycraft.
• Rocket Boots Xtreme and Rocket Boots Xtreme Lite can no longer be used in the arena. These no longer have a failure chance. I didn't use them, but this makes me sad. I all ready couldn't use my Poultryizer for an interrupt/temporary silence, and now I can't use my boots to go ZOOM across Nagrand Arena and away from that crazy frost-slinging mage who's trying to throw ice lances up my plated butt. Engineering just became that much less useful for PvP retribution paladins.
• Zoning into an instance on a PvE realm will now drop your PvP flag. No more raid AIDS! You can do arena/battlegrounds before a raid and not have to remember to drop your PvP flag! This, of course, only applies to PvE realms, but I play on one so this is important.
• Pendant of the Violet Eye: This item will again work correctly with Holy Light and Flash of Light. This is not retribution specific, but this is great news for our holy brothers and sisters. The [Pendant of the Violet Eye] is great for holy paladins, and that it works correctly is definitely a plus, as it's one of the best mana regen trinkets out there.
• Righteous Defense will now properly check for range when a mob is selected. Go ahead, taunt away. They're fixing stuff with Righteous Defense every day.

This of course is not the complete list of patch notes - these are only selected notes that I feel impact retribution paladins or would be interesting to retribution paladins in some way. Go to WoW's main page for the complete list.