Leaning towards going Boomkin on the Druids.
Possibly a mix of Boomkin/Resto, have thought of that too.
Chances are, full honor geared Ferals will gain honor faster than zero resilience casters.
But the Druids aren't that fun with the nerfs, so haven't done a lot of BG's with them post 4.0.6
Hopefully some of the nerfs are undone, but Blizzard seems to hate the idea of Ferals being competitive; 8 out 300 players were Ferals for the top 100 3v3's teams, obviously too strong...

For the healer team.
Thinking of going Resto Shammies.
The Tremor, on round-robin, as a raid-wide 30 yard Fear break... doesn't matter which group they end up in.
Healing Stream is party only, I believe, but they can each go with Earth Shield.
Grounding is still decent against casters.
For offense, Lightning Bolt is basically mana free, they have Flame/Frost Shock, Lavaburst etc.
And five minute Fire Elementals (plus 10-min Earth Elementals).

Also thinking of leveling the Pallies (Exorcism/HolyShock) to 74th.
To run them in the 70-74 bracket, as there are a ton of 70 twinks.
This has the advantage of 2k honor for a full set of pvp gear, that once earnt will never need an upgrade.
No need to arena for superior gear than BG's, as honor already buys the best they'll ever get.
Not a lot of AoE healing, but still have Focus for single target heals.. with five pallies, could easily keep five singles up, in mass melee.
Plus they have strong passive self heals, via Beacon and Protector of the Innocent.
Plus the plate + shields + bubble + divine protection etc.
This is an experimentation at the 70-74 bracket; see how it goes.