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 7.0.3?
1.) This is the pre-patch for Legion, Rets and many other specs have been changed completely.
2.) Abilities Removed: Hammer of Wrath, Exorcism, Blessing of Sacrifice, (baseline) Word of Glory, Emancipate, Divine Protection, and all Seals
3.) Judgment now applies a debuff to the targets it deals damage to, increasing holy damage taken on spenders such as Templar's Verdict.
4.) Talents are completely changed.
5.) You can use a total of 3 blessings at any time. For example, without a party you can have all 3 buffs on yourself. In 3v3 your DPS and yourself can have Might while your healer can have Kings.
6.) Glyphs are Removed.
7.) Hands became Blessings. Make sure to update your macros!
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.
Highly Recommended: Final Verdict
This increases your Final Verdict damage by 20%. Currently the other 2 talents just don't beat out the damage you can gain from Final Verdict in a PvP scenario.
Recommended: Zeal and More Testing Needed
This tier is much more debated than the level 15 one. Some people prefer The Fires of Justice which is higher single target DPS if you can use CS on CD. I find this rarely ever occurs in PvP especially now with our lack of mobility so I prefer Zeal which deals more damage on a longer CD and also can cleave. Greater Judgment is also not bad, this tier needs to be tested more.
Recommended: Fist of Justice
Logic here for Fist is very similar to WoD, the other 2 talents are mostly used if you want to strategize around them. Repentance is somewhat improved in the fact that it doesn't use the CD if you cast it on a Beast, but you'll require a lot of effort to land it especially on Druids. Blind is essentially the same as before, not very useful unless you want to rush a game.
Recommended: Virtue's Blade or Blade of Wrath
Burst vs Consistent Damage. Divine Hammer lowers the damage too much to be used in an arena setting, but perhaps in Battlegrounds it could be used.
All 3 talents here are quite unique in what they do. I usually default to Eye for an Eye when I queue skirmishes since that talent is amazing for fighting Melee. If there is no melee on the opposing side any of the other 2 talents will obviously perform better. Try to use Justicar's Vengeance in stuns. Word of Glory is the best if you're not being targeted at all, but you have to be very close to your healer or whoever is getting hit (think small Holy Nova.)
Recommended: Divine Steed or Seal of Light
Our Mobility in this pre-patch is horrible, and definitely needs a talent to help it. Both these talents help mobility, Divine Steed is burst and doesn't spend holy power while Seal of Light will keep us 20% faster nearly the entire game.
Recommended: Divine Purpose or Holy Wrath
Holy Wrath does 50% of your missing HP as damage. This is incredible burst, but requires very specific scenarios to be used effectively and has a long CD. Divine Purpose is a more consistent choice.
Gems / Enchants / Stats
Gear is scaled in Arena, in general it has a much smaller relevance in PvP. This is still being tested, but the stat-priority assumption is: