This guide is written mainly for players new to playing retribution in arena / PvP.
Guide is also posted in a different format on: http://www.arenajunkies.com/topic/185273-vanguards-retribution-paladin-pvp-guide-602/
What changed about Rets in 6.2?
1.) New gear means damage and healing will be different from last patch. Pacing will feel significantly different from 6.1.
2.) Hand of Freedom glyph received a slight nerf mid-way of 6.1. It's still an awesome glyph, but not as important before.
3.) Asides from the above and other classes receiving numerous buffs / nerfs, Ret Paladins themselves did not really change much besides a slight mastery nerf.
In the talent picture I selected talents that I use as default in arena. Talents and Glyphs should be changed every arena match depending on what composition you're playing, what you're up against, and what strategy you and your opponent might execute.
Usual recommendation: Long Arm of the Law.
Why Long Arm of the Law? Well Judgement cooldown is incredibly short, so this sprint is almost on demand.
For most compositions I recommend Fist of Justice.
Any 3 of these talents are viable. What is best will depend on many factors such as your play-style, the composition you're running, and what you're fighting against. Fist of Justice is an easy to use instant CC that allows your teammates to easily chain off of as well. Fist of Justice also increases your HOJ range which is very useful for a melee. The Blind talent will now be quite useful when you don't have Fear on your team. Remember, this Blind is like the Rogue Blind for DRs and not a disorient!
Selfless Healer is recommended for most cases. Sacred Shield for teams that will purge you a ton.
Having Selfless Healer is useful to get those fast and lower mana costing heals on yourself or your teammates.
Due to how Selfless Healer gets purged in 1 hit no matter the stacks, Sacred Shield is superior if you're fighting teams that are going to purge a lot.
Recommended: Clemency or Unbreakable Spirit
Clemency, a previous patch made Hand of Sacrifice dispel magic effects. Clemency was already really strong for most scenarios since you can use freedom, sacrifice, and protection twice.
Hand of Purity is awesome for counter comping into DOT cleaves. Hand of Purity is to be used when you fight a DOT Cleave such as affliction warlock teams.
Unbreakable Spirit is particularly good when you know you're getting trained, especially against Caster Cleaves. The buff in 5.4 made this talent very strong, and I usually use this over the other 2 specs when fighting against double Caster compositions.
Recommended: Holy Avenger
All 3 talents here are quite strong, but Holy Avenger usually performs best for burst which fits the current meta game with long CC chains to get kills. Holy Avenger also lines up with Avenging Wrath perfectly to use together for stacking CDs.
Recommended: Execution Sentence or Holy Prism
Execution sentence provides the most damage, Holy Prism provides more utility (more healing, lower CD.)
Recommended: Final Verdict or Empowered Seals
Final Verdict gives the most damage against targets that aren't cloth or leather without a fight, Empowered Seals could be better vs low armor targets and if you need to run or chase a fast target (Seal of Justice sprint).
Empowered Seals would also be the superior defensive talent due to it's kiting ability. I believe this last tier is a bit of preference between these 2 talents now and what comps you're playing and playing against. I recommend trying both and see what you prefer.
Most major glyphs are purely preference. Prime glyphs there are several choices with Templar's Verdict in my opinion almost always being mandatory since Ret is always a viable kill option. The only way you'd ever take this off is if you're 100% positive you will not get targeted.
Templar's Verdict (Necessary) - Now works on exorcism as well!
Burden of Guilt (It allows you to slow on your judgement now in 5.4! Highly recommended especially when you have no slow on your team.)
Double Jeopardy (The extra 20% burst is really insane at the moment, purposely judgeing a focus target then swapping back right before you Avenging Wrath is really useful)
Word of Glory (Extra damage for all those WOGs you do!)
Glyph of Freedom - It reduces CCs on any targets you freedom by 25%. This is an amazing Glyph that works on stuns, Sap and more. A patch in 6.1 nerfed this, it is now not usable while you're stunned or CC'd. It's still very useful for your teammates and sometimes you can use it preemptively on yourself, but overall a less important glyph than before.
Really doesn't matter, Hearthstone glyph is cool though!
Gems / Enchants / Stats
+50 Versatility on everything if you have gem slots.
No more reforging in WoD!