As well as the changes said above, pure of heart = 5 second curse of tongues which is amazing, five points in toughness > improved righteous fury, for the movement impairing effects time reduction, as well as the additional armor. Sacred cleansing will also be nice for rogues, mages, etc. If you were to cleanse winter's chill until you gain the debuff, a resisted frost nova or frostbolt is kind of a big deal, or resisting rogue poisons like crazy. The points out of holy guidance are negligent in my opinion.
Imp Hammer of Justice, especially for 2s, helps us in that we don't have much CC, and it cuts cooldown in half. Divine Guardian is nice but not worth two points that can be spent in Holy.
With IoL nerf we're still as dependent on casts as we have ever been, despite IC FoL's. Judgement of the Pure is needed. Alternatively you can go 3/5 and max out Divine Intellect/Holy Guidance, which I have at 4/5 each, and a 6% haste buff would still be substantial.
Blessed Life is fun for BGs but honestly if they're targeting you in arena they're likely doing you a favor, especially in 2s.
Enlightened Judgements is also necessary, it stops runners and would be wonderful if let's say you needed to stop a Hunter from re-summoning a pet, or someone that's drinking in LOS but out of range.
Just my two cents. I'm not the best arena player, mainly play 2s and hover in the 1700s, but anyways my two cents.