Did anyone have the time to test how action bar mods work with the dual spec feature? Will they require extensive updates?

I come bearing gifts! Ulduar boss spells:

Spells with their URLs underlined are likely Hard Mode spells. Only spells with the name of a boss, or of a known link or mechanic of that boss, are listed.

Flame Leviathan
Overload Circuit - Thottbot: World of Warcraft - Overload Circut - "Overloads the Power Core of the Flame Leviathan", appears to trigger mana regeneration (?)
Scorch - Thottbot: World of Warcraft - Scorch - Flamestrike, basically, and makes "Iron constructs in the area eventually become molten".
Tar - Thottbot: World of Warcraft - Tar - Leaves a blotch of Tar on the ground. Tar can be ignited. (Likely a vehicle ability)

Kologarn
Stone Grip - Thottbot: World of Warcraft - Stone Grip - Deals 7000 Nature damage per second to the target until Kologarn takes 150000 damage.

Freya
Attuned to Nature 25 Dose Reduction - Thottbot: World of Warcraft - "Reduces Freya's Attuned to Nature stacks by 25" (spells also exist for other amounts)
Brightleaf's Essence - Thottbot: World of Warcraft - "The presence of Elder Brightleaf increases magic damage dealt by Freya and her Allies of Nature by 50%"
Freya Summon Chest - Thottbot: World of Warcraft - Freya Summon Chest - it would appear that we do not kill her. There are eight spells of the same name, presumably for various difficulties.
Ironbranch's Essence - Thottbot: World of Warcraft - Ironbranch's Essence - Increases damage dealt by Allies of Nature by 50%.
Lifebinder's Gift Trigger Missile - Thottbot: World of Warcraft - Lifebinder's Gift - Summons an "Extraplanar Spore"
Stonebark's Essence - Thottbot: World of Warcraft - Stonebark's Essence - Increases physical damage dealt by Freya by 50%.
Summon Allies of Nature - Thottbot: World of Warcraft - Summon Allies of Nature
Touch of Eonar - Thottbot: World of Warcraft - Touch of Eonar - Heals Freya for 6000/s (10) or 24000/s (25).

Thorim
Berserk - Thottbot: World of Warcraft - Berserk - either Thorim has adds, or he aids the players at some point.
Deafening Thunder - Thottbot: World of Warcraft - Deafening Thunder - Silences targets within 15 yd of a "Stormhammer" strike.
Thorim's Hammer - Thottbot: World of Warcraft - Thorim's Hammer - Deals 15000 Stormstrike damage (that's Nature/Physical) to all nearby enemies.

Hodir
Flash Freeze - Thottbot: World of Warcraft - Flash Freeze - Freezes the target in a block of ice. Other spells mention that a frozen target hit by flash freeze dies instantly, and that it is in fact Hodir's ability.
Hodir's Fury - Thottbot: World of Warcraft - Hodir's Fury - 15000 Frost damage and a 9 second stun to all enemies.
Shatter Chest - Thottbot: World of Warcraft - Shatter Chest - Most likely Hodir's loot mechanic.
Toasty Fire - Thottbot: World of Warcraft - Toasty Fire - Likely a player ability. Creates a fire which prevents the effects of Freeze and Biting Cold. Extinguished by "falling ice shards" or "powerful frost magic" - most likely Blizzard and Flash Freeze.
Blizzard - Thottbot: World of Warcraft - Blizzard - 1.5k (10), 3k (25) frost every 2 sec for 10 sec.
Biting Cold - Thottbot: World of Warcraft - Biting Cold - A la Keristraza, only only "diminished" by movement, not removed.
Winter's Embrace - Thottbot: World of Warcraft - Winter's Embrace - Absorbs 185k damage, and while active increases physical damage dealt by 100%.

Mimiron
Mimiron's Inferno - Thottbot: World of Warcraft - Mimiron's Inferno - Deals 15000 Fire damage to all enemies and "leaves a blazing trail behind"

Yogg-Saron
Dominate Mind - Thottbot: World of Warcraft - Dominate Mind - Mind controls a target temporarily and reduces Sanity by 20.
Low Sanity Screen Effect - Thottbot: World of Warcraft - Low Sanity Screen Effect - Just a visual.
Psychosis - Thottbot: World of Warcraft - Psychosis - 20000 Shadow damage and reduces 20 Sanity.
Sanity - Thottbot: World of Warcraft - Sanity - 100 stacked buff, if it reaches 0 you are permanently mind controlled. One Sanity regenerates per 3 seconds.
Touch of Dominion - Thottbot: World of Warcraft - Touch of Dominion - Subjugates the target to the will of Yogg-Saron, weakening it (-10% HP and damage), yet "conferring a subtle control". Appears to stack every 180 sec.

Unknown but likely Raid spells
Brain Link - Thottbot: World of Warcraft - Brain Link - Links two targets, they take 3000 shadow/sec if more than 15yd from each other.
Conservator's Grip - Thottbot: World of Warcraft - Conservator's Grip - The "grip of the Protector" pacifies/silences.
Gravity Bomb - Thottbot: World of Warcraft - Gravity Bomb - Debuff, after 9 sec deals 20k shadow damage and pulls all friendlies within 20 yards to the debuffed player.
Solar Flare - Thottbot: World of Warcraft - Solar Flame - Deals 8k (10) or 14k (25) Fire damage to a number of targets "based on Brightleaf Flux"
Summon Guardian - Thottbot: World of Warcraft - Summon Guardian - Summons a Guardian of Yogg-Saron from the ether.
Summon Saronite Vapors - Thottbot: World of Warcraft - Summon Saronite Vapor - Summons a cloud that converts health into "pure mana energy" (Saronite Vapors - Thottbot: World of Warcraft).
Supercharge - Thottbot: World of Warcraft - Supercharge - Likely a trash or multiple boss encounter ability. Increases all allies' damage by 25% and grants them "an additional ability". Probably linked with:
Supercharged - Thottbot: World of Warcraft - Supercharged - Buff, 50% additional damage and melee strikes cause a 7000 Nature damage in a frontal cone.
Vengeful Surge - Thottbot: World of Warcraft - Vengeful Surge - Like the Supercharged buff above, but 75% additional damage and 50% attack speed, as well as the nature damage strike proc.

I was thinking about the mystery boss on the Old Kingdom map some more, and could it be an event boss? Maybe Ahune will be in there this year?

I hope this fight will be more than a blatant copy of Sartharion.

"IRONBRANCH, THE FLOWER BED IS IN DANGER! ASSIST ME!"

I believe that ilvl increases are logarithmic now, so 213 -> 226 would be a flat 13% increase. - Item Level Mechanics

There are still some questions with hard mode and loot and difficulty, due to hard-mode encounters appearing to have variable scaling (0-4 for the Flame Leviathan and maybe 0-3 for Freya). There's a possibility of requiring some amount of gear from the scaling up before tackling the final form. It will also be interesting to see how they compare with 10 man vs 25 man versions of the encounter - based on the gear, a solidly-geared group at the Naxx25 level should be able to start on the Ulduar10 hard-mode.

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Does anyone have a map of Ulduar? How linear is the dungeon, especially the watchers area and post-watchers? I'm wondering how much working on the hard-mode achievements conflicts with completing the dungeon.