Talent wise, seems to me a good option would be something like this:
http://db.vanillagaming.org/?talent#0x0xIzEstZxVcoInsect Swarm -2% hit debuff is a boost to avoidance. Pairing this with cheaper shapeshifiting (can't cast resto spells as moonking) makes sense, so you can hope to have near full uptime on the spell seems a good use of the resto talents that you'd need to get the in combat regeneration from Reflection. The anti-pushback talent could also have some use if you desperately need to heal yourself (while getting hit), and probably better than healing touch cast time reduction.
Nature's Reach seems less of an issue here as tanking mobs would practically place them right in front of you.
Talents that I considered but skipped.
Nature's Grasp and Improved could possibly help with CC by letting you snare one mob, but with the outdoor limitation it could only be of use in Zul'Farrak from 5 mans, and ZG in raids. Too situational. Same reason for Imp Entrangling Roots.
If you're specifically going to do ZG for a while, I suppose it would be worth looking into them though.
Omen of Clarity. With the moonkin mana limitations a free cast could maybe be a good idea, If pairing it with something like Judgement of Wisdom, it'd have a double effect of regeneration, so you could melee mobs sometimes between casts. Problem that I see is that in order for this to meld in properly with the rest of the build, the proc rate should be quite high. You're just doing minimal threat auto attacking as moonkin, it should at least be reliably quick to regen during those downtimes. I admit I have no idea what is the proc chance of Omen, but considering a number of items in the server, I doubt it's that high.
Regardless, the chief reason why I skipped it, was because 5/5 Natural Weapons and 1/1 Omen, would take 6 talents that would simply make it impossible to get Insect Swarm or Reflection. The trade off seems negative with that in mind.
Thick Hide.
Another idea that crossed my mind was to get 5/5 Demoralizing Roar to pave the way for extra armor in the 2nd tier of feral. It'd then be possible to pull, go bear, cast demo roar for more mitigation, and swap to moonkin immediately after. Downside of this, again, would be losing the -2% hit debuff and the 15 % mana regen.
It'd be worth exploring though perhaps. I don't know if talented demo roar would actually decrease more or less incoming dmg compared to Insect Swarm, and the armor boost would really help in that case. Any input here is welcomed.