I think this is a constructive thing you've got going here, and quite personally I have hated arenas from their inception. Why? Because the only games that feel valid in a player versus player environment using line of sight mechanics and use of terrain/geometry to your advantage should be shooters. Using said mechanic in WoW just feels retarded and sloppy. And since we have to hump and cling to pillars ravenously (which is boring, aggrivating, feels VERY un-paladin, and quite frankly is just stupid) to avoid things paladins are highly susceptible to, it seems bloody obvious change is needed. The healing throughput from beacon and a high resil rating/sta seems to be the only thing between us and the all mighty. That being said, holy needs a change.
There are too many talnets in the holy tree which I don't know a single person who uses. Need I remind you that Sacred Cleansing has been bad forever and never adjusted, but Seal of Command was broken for a few weeks before it got 'fixed' to a cleave? I think it's worth looking at all the crappy, archaic talents which most folks don't even consider when building for pvp.
Seals of the Pure - Why is this even in holy? It might hold the propensity to give holy more offense, but you need other seals glyphed to have enough throughput or mana conservation (ala light/wisdom seal glyph). And who in their right mind isn't humping a pillar or spamming heals to try to desperately heal through mortal strikes? Perhaps if you could glyph Seal of Vengeance to have a % mana return from the dot tick (so more dot/stack damage means more mana back) this might be worth a piss to a healer (and ret, since you woldn't have stupid glyphs like the SoCom mana glyph and could perhaps be better designed to actually do damage which would make Command remotely attractive for non-cleave team pvpers)
Purifying power/Unyielding faith - Both of these reduce Curse, Disease, Poisons and Fears/Disorientate effects by 33/30% respectively. But 4 talent points for, to be honest, a negligible gain feels like a complete waste of 4 points. Rarely it seems will anyone choose one or the other, let alone both. And in choosing one or the other, one would obviously prefer Unyielding faith alone. However, the talent itself is lackluster compared to the other talents in the prot tree like, say, imp devo aura or DG. Why not roll these both into a 2 or 3 point talent which reduces it all by 30% so we don't feel like we're giving up something that's worth a damn, unlike these two talents. Furthermore, throw us a bone and make it reduce mana burn effects, so we can actually melee with SoV as suggested in the above talent change.
Blessed Life - more and more I find myself avoiding this simply to obtain much more needed talents for pvp (imp devo, DG, again) This talent, you would assume, would save you from being burst to death. In the month I used this talent (forced myself to), while closely watching, there wasn't a single time it saved me from burst situations, which seems to have been it's only real purpose. The chance is simply too small. As simple and boring as the talent is, why not add a % chance to increase your SP or make you un-interruptable for 2-3 seconds for a short duration with a small proc cooldown?
Sacred Cleansing - It's been said 1000 times before. it's a chance-of-a-chance. In otherwords, a complete and utter waste of not one or two but THREE talent points. I'd choose this over imp devo, if your cleanses refreshed sacred shield and/or increased healing to that target for a short duration in addition to the resist bonus.
Perhaps there are others that find certain other talents useless too.. I don't know. But those are talents, after forcing myself to use for some time just to hope to justify them in pvp, I have found to now simply avoid entirely. If all the above fixes were to be added, it might solve the big problem of why prot was so popular over holy... mana loss/regen, interruptability, offensive ability (via a SoV dot as suggested above) and simple lack of interesting talents in the holy tree. Sure, there's no comparing the offensive power of Avengers Shield, but in light of the inc changes to prot healing, something, imo, needs to be done.
Oh, and
here's me (may or may not be holy spec at time of link click).
Is a redesign/revamp of the holy tree likely in the next year before Cataclysm is released and everything is changed, anyways? Unlikely. Which really blows, and who knows who might throw in the towel out of sheer boredom/annoyance before then, eh?