Haven't really surveyed Moonkin loot yet. I always put this off since loot's kind of tedious. The basics are easy--haste/crit where possible, otherwise crit/spirit is next-best. Well, crit and haste are equal post-caps, but preferring crit as a rule of thumb is fine, since the cap is significantly higher. Main issue will be, which hit items are the best to try to work in? This is basically a BIS list project, which as I always note is not the best way to look at gearing. But I have to have one handy for my guild anyway, and it's a good way to look over all the loot.

List of itemization:
Set items: Legs/hands have hit, others are crit/haste.
277 items bearing crit/haste: Leather-none. Cloth-feet/waist. Other-finger/back/neck/offhand.
277 crit/hit or haste/hit: Leather-none. Cloth-shoulder/wrist/legs/hands/chest. Other-fingerx2/neck.
277 crit/spirit or haste/spirit: This is available in all slots.
264 crit/haste: Leather-feet. Cloth-waist/head/legs/chest. Other-finger/neck. Emblem: hands/waist/chest. (Unsure off the top of head whether 264 crit/haste will be better than 277 spirit).

Glancing over this:
--Items in the first group (277 crit/haste) are obviously BIS. So that locks in Head/Chest/Shoulder/Finger (x1)/Neck/Back/Offhand.
--Beyond that, it's not terribly relevant where we get our hit rating, except that it's ideal to get it from places that don't conflict with the prior group. That leaves Legs/Hands/Finger. The two T10 set items and the rep ring gives 239 hit. Enough for alliance--horde will probably use 2-3 Veiled gems beyond this, or swap another hit ring, or the cloth bracers.

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So, rough cut at a BIS list:
Head: Set
Neck: Crit/haste Blood Queen
Shoulder: Set
Back: Crit/haste Valithria
Chest: Set
Wrist: Crit/Spirit Valithria (potentially crit/hit cloth Deathwhisper)
Hands: Set
Waist: Haste/crit cloth Marrowgar (otherwise haste/Spirit Professor, or haste/crit Emblem)
Legs: Set
Feet: Haste/crit cloth Festergut (otherwise haste/crit 10-man or crit/Spirit Gunship)
Finger: Haste/crit Gunship (potentially hit/crit Marrowgar or hit/haste Blood Princes)
Finger: Rep
Trinkets: Open yet--some subset of Reign, DFO, Spyglass, and Phylactery.
1H: Crit/Spirit Marrowgar
OH: Crit/haste Blood Princes
(2H: No crit/haste 2H, so 2H options won't beat 1H/OH, unless Nibelung turns out to be really good).

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Important things pre-BIS (where you in fact spend all your time, since nobody actually gets their perfect BIS set together):
--You're likely to want all 5 set pieces long-term, so plan on that.
--Hit cap isn't going to be a huge issue due to set pieces and rep ring. The cloth hit bracers might be a handy item to snag, or one of the hit rings. Other hit items probably won't have much long-term use.
--In every other slot, just take whatever crit/haste pieces or ilvl upgrades that you can your hands on, as usual.
--Use whatever ability you have to control your fate in your guild's loot system to try to get the neck/ring/cloak/offhand that all casters will want. The stuff in the leather slots will come easy.

I forgot it, editing it in now (although in my own case, I'm using my rep ring for Resto, as I'm sure some others are). It doesn't change too much, since I was including a hit/haste ring anyway. This one's probably better due to the proc. It actually makes things simpler, as there will be very little need for hit cap juggling.

I think I'm going to be stuck with Nibelung for quite a while, the healers are also set on getting the Marrowgar dagger it seems. It isn't a hugely bad item, and I do believe Blizzard will be fixing the proc.

The interesting thing I found last night was that it procs off some random things. I was playing around with the jet-pack last night on 25 man Gunship, and once when I landed it procced a Val'kyr. Of course she just sat there and did nothing. I thought it was an interesting observation.

I actually found it very easy to make a BiS list this time as an alliance druid. I can get to 239 Hit Rating just by picking up the Heroic Tier Legs and hands and using the Exalted Rep ring. It feels like my hit cap choices were made for me. Unfortunately it really sucks for you horde moonkin unless. I don't see a good way for you guys to reach the hit cap without being way over or socketing some Hit gems.

Trinkets: I think the real sad thing about my ICC BiS list is the trinkets. I quickly realized that due to the various caps the two Reign trinkets will probalby remain BiS for me. The heroic version of Spy Glass may over take the normal version of Reign, I doubt that will be true if your over the crit cap.

Arthas: The big question in all of this is what will Arthas drop? I wouldn't be surprised if a lot of it had strange procs and stuff as well, and that could make our BiS lists really painful.

Dont know if it was allready discussed here,but how do you guys gonna get your 2 purple gems for the Meta?Since there are neither blue sockets in t10 nor in most of the items considered to be BiS.I mean,its obvious that one would be in the second ring slot,since
[Ring of Rapid Ascent] or [Loop of the Endless Labyrinth] are BiS depending on our hit.But what about the second gem?[Crushing Coldwraith Belt] i guess,but what your gonna do,till you get it?I see a tons of flames comming from other caster,if we would roll on the 264version of it,since we have [Belt of Petrified Ivy] which is more or less the same.
I just cant stand the idea,putting a purple gem into a red socket ;(

[Plague Scientist's Boots] also has a blue socket

If you're really in a jam finding a spot for a blue/purple gem, you can always put it in your prismatic belt socket.

Long term plans : [Plague Scientist's Boots] and [Crushing Coldwraith Belt] for the 2 blue socket

you will also have [Frozen Bonespike], [Bracers of Eternal Dreaming] and [Blood Queen's Crimson Choker] with probable +5sp bonus with purple gem (not as good as belt and boots which are +7sp)

And also [Nibelung] if the proc is fixed for a +7sp socket bonus

I disagree, [Meteor Chaser's Raiment] is better than the 264 t10 and provides more versatility with the 3rd socket and a better socket bonus than either of the items with blue sockets mentioned above. Unless you get the 277 t10 this is the chest piece you'd wanted granted you get the other 4 pieces of t10.

They have a cloth belt for badges just like it, so...
That said i plan on getting the Ivy belt and saving my points for other things

And also considering that you will want 4p T10 (or 2pT9+2pT10 in the meantime) you only have room for 1 offpiece.. You should get the crafted leggings instead of the T10 leggings, especially since it let you drop some hit (and there are alot of good pieces with hit, while the crit+haste are rare).
Remplacing the crit+haste T10 chest (with perfect socket color) for a crit+hast offpiece (with inferior socket color but more versatility since there is one more slot) effectively force you to use the T10 leggings.. Since you play horde you will be hit caped with just T10 264 hands+T10 264 legs+Rep ring+off piece (like [The Lady's Brittle Bracers]), and you will have to fill everything else with haste+crit (expect some competition here).
And it will get worst when you start getting 277 pieces.

In the end you are making your life harder than necessary for almost no gain.

Considering a plausible weight scale of : sp=14; cri=11; haste=9; int=6; spirit=5

[Meteor Chaser's Raiment] get a score of :
130.4 (with 3 [Runed Cardinal Ruby])
129.91 (with [Runed Cardinal Ruby] + [Potent Ametrine] + [Purified Dreadstone])

[Sanctified Lasherweave Vestment] get a score of :
129.91 (with [Runed Cardinal Ruby] + [Potent Ametrine])