Whereas the full ilevel 258 set I put together with Rawr had a whopping 1019 crit rating, which is so far beyond the cap that the 2T8 bonus loses ~75 dps. It's certainly possible to put together a set with a lot less crit rating and run 2T8+2T9; the Optimizer is far from perfect. I'm just saying, it was an observation that I noticed when playing around with gear sets, and it's certainly achievable with the high item level gear.

I played around with Rawr and the T10-264 gear. It's probably not a surprise to anyone here, but if you're wearing the 258 level T9, assuming these are the stats and not placeholders, you're still going to be wearing 2T8+2T9 for a while yet. The 4T10 set bonus may be the strongest 4-set out of them all, but the 2T10 is showing so weak and the 2T8 and 2T9 bonuses are so strong that it's just not enough. One interesting thing I did notice, though, is that it dropped the [Legwraps of the Awakening] for the T8 legs and swapped in the T9 gloves, because the T10 helm is overwhelmingly strong.

What you said has some truth but also a lot of emphasis was put on AoE because of the lack of gear people had when they first did the encounter. Now that we've been saturated in >=245 gear to no end, DPS isn't as challenging as it would be in <=239 gear.

So it seems we'll have to wait for 4pc t10 before we start breaking the other set bonuses, is that right? Or do we need the higher level T10 set pieces assuming they exist?

It's looking like we'll probably need the higher level T10 set pieces. I don't think it would take much of a buff to the 4T10 to make it worth using over 2T8+2T9, but I haven't investigated that far yet.

EDIT: Through some playing around, buffing 4T10 to 7% of the spell damage for the dot would make it pull roughly even with a 2T8+2T9 setup. Anything higher than that, and 4T10-264 would be worth getting. I don't really see how they could cleanly change the 2T10 set bonus, since it's tied to Clearcasting, so it looks like we'll be sitting on 2T8+2T9 until we can get the 4-piece.

It might happen, but Resto Druids were widely considered to be overpowered in Ulduar.

I don't think that is true of Moonkin at t7, t8, or t9. I don't see any reason to expect it in t10.

If that is correct, it seems like buffing 2t10 (which is perhaps 3-4% on a PW fight) or 4t10 would be more appropriate.

A 2t10 buff might be in the form of fixing Omen of Clarity, so that spells see 3.5 ppm (off of base cast times, Starfire=20% proc) rather then the current 3.5 ppm (off of 1s cat auto attack, SF=5.8% proc).

Is that how it is now? 5.8% for all spells? I think I missed when someone determined this. Need to add both bonuses to WC.

I believe at the moment we're all imagining it will work like Ignite.

Think of it like the mage's Ignite. When a critical hit occurs, the dot damage for that crit is added to whatever dot damage is left, and the dot's timer is reset to zero. Your last argument, about it never getting a chance to tick, makes absolutely no sense; it will always tick at least once, and the only time you would lose damage from it is if you managed to chain 1-second Wrath crits from the beginning of a fight all the way to the end, in which case the final 3 ticks would not deal any damage. Since such a scenario would never occur, it is most certainly worth quite a bit of damage. Now, I represented it in Rawr optimistically as a simple 5% multiplier on the critical strike damage of Starfire and Wrath, which would correspond to an Ignite-style dot that never munches any ticks.

It is looking to me as if something has changed. Someone should check their own logs to see.

Ony:
5 Melee hits (1.8s weapon): 1 OoC proc.
4 Starfall casts: 1 OoC proc (on cast, not on damage).
64 Wrath casts: 0 procs.
22 SF casts: 0 procs.
396 Hurricane ticks: 10 procs (including 3 at once).
15 MF casts: 3 procs.
17 IS casts: 1 proc.

ToC5:
24 SF: 1 OoC (during Starfall, I suppose it could have been a Starfall proc)
1 Abolish Poison: 1 OoC proc.
18 MF: 2 OoC proc.
4 Starfall: 1 OoC proc.
18 IS: 3 OoC proc.
70 Wrath: 0 OoC procs

Proc rate on instants seems fairly high. Procs on SF and Wr seem to have disappeared. That is a big change. I'm questioning my logs and/or analysis.

I've been thinking the Spell Rotation part of the TTT guide isn't totally clear, I might update it some. While thinking about that, I figured I should try to write down our decision tree for casting precisely. Here's what I came up with:

if (Lunar Eclipse is up and time remaining is >1 Starfire cast but <2 Starfire casts)
cast Starfire and cancel Eclipse when it completes
elseif (Moonfire is down)
cast Moonfire
elseif (Insect Swarm is down)
cast Insect Swarm
elseif (Lunar Eclipse is up and not about to be canceled by WiseEclipse)
cast Starfire
elseif (Lunar Eclipse is up but about to be canceled by WiseEclipse)
cast Wrath
elseif (Solar Eclipse is up, Bloodlust is up, Lunar Eclipse is off ICD, and Bloodlust time remaining is greater than 15s)
cast Wrath and cancel Eclipse when it completes
elseif (Solar Eclipse is up)
cast Wrath
elseif (Lunar Eclipse is on ICD for more than one Wrath cast time + one Wrath travel time)
cast Starfire
else
cast Wrath

Just tossing this up here to see if it looks right to people.

Also, someone should use this to make a Moonkin version of FaceMauler (called BirdBrain?)