This post contains info that isn't yet in the Wiki, but will be soon, I'm sure. If you want to be surprised by whatever is at the end of the Ult Bosses, stop reading now.
I'm quite a gearhead, and the new armors are rather lacking in my opinion. Here's the stats for each below. Statuses are "max" unless otherwise specified. Bonuses are on one piece, so medium + medium = very high, just like Vog/Skolver sets. Data source, with additional Spoiler screenshots:
http://forums.spiralknights.com/en/node/29964#comment-178017
Spoiler - do not view the link's slideshow if you do not want to know what happens. The screenshots are revealing.
Almirian Crusader Helm & Armor
Normal/Shadow
Negative Fire Medium
Curse Medium
Arcane Salamander Mask & Suit
Normal/Elemental
Fire
Damage Bonus to Slime: Low
Damage Bonus to Beast: Low
Heavenly Iron Helm & Armor
Normal/Shadow
Negative Shock
Curse
Damage Bonus to Fiend: Low
Sword Damage: Low
Ice Queen Crown & Mail
Normal/Piercing
Stun
Freeze
Mercurial Demo Helm & Suit
Normal/Elemental
Shock
Movement Speed: Low
Bomb Damage: Low
Snarbolax Cap & Coat
Normal/Shadow
High Poison
High Freeze
Sword Damage: Medium
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First of all... nothing for Gunslingers? That's a shame. I thought with the IMF release giving Gunslingers lots of love that tread had changed.
Three new shadow sets! Yay! That is something that is certainly missing from the gear options. So first some comments on those...
The most useful being the Snarbolax which is a great alternative for Skolver. Also it can be used as a shadow alternative to Dread Skelly, Divine, etc. but with a sweet sword bonus. I guess maxed status would have been too much, so it is stuck with Highs instead. On the plus side, if you do mixed Skolver/Snarby you should be immune to SMB in PvP and it would help with GF hits just a bit. Of course, you'll then be partially vulnerable to piercing, so might not be the wisest course of action. I'm guessing that wearing full Snarby should get you caught in SMB, even if just for 3.5 seconds. Maybe have both sets available and switch it out depending on the other team's weapon of choice (and hope they aren't well armed.)
Heavenly Iron could be useful for UFSC. No fire resistance means you'll want to grab a high/max Fire UV for it or avoid catching on fire. Clearly it is meant to be a Fiend killer as a full set will match Divine's bonus. But the negative shock is unfortunate as T3 Shock Fiend Arenas are problematic and would be downright deadly in this set. Do not use it in PvP. As if Polaris or VT needed to be any worse.
Almirian Crusader - yeah... negative fire and no weapon bonuses? Thanks, but no. What niche does this fill exactly? Graveyard? Looks nice though.
On to the new Bomber gear - the Mercurial Demo Set. If you like the traditional Mercurial Set you'll love Mercurial Demo. Elemental instead of Pierce makes it more useful, especially for IMF/UIMF. I'm glad to finally see a bomber set with Shock, but sadly no serious bomber would be caught dead in this travesty. The same bonuses as Bombastic means its predecessor, the Heavy Demo Set, gives you better DPS. Rather nice costume though. I don't recommend this instead of Mercurial for PvP. Elemental isn't as common as Pierce and the bomb damage bonus might as well not be there.
Arcane Salamander... where do you need Normal/Elemental/Fire? UIMF? Actually, that looks a lot like Volcanic Salamander, but that set has a Medium Slime bonus on each piece, not Low. Oh! I know where I've seen that setup before... Vog set. (Derp) But that has ASI Medium instead of low damage bonuses... how very strange. I don't get it. Maybe this one really was meant to just be a costume. Or maybe someone booched the stat tool tip. Time will tell.
Finally, the Ice Queen Set is a rather regal looking costume. The stats are similar to Skolver but with better piercing and Stun instead of a Sword Damage Bonus: Medium. If you aren't already using full Skolver for URJP then Ice Queen would be a nice alternative, especially given all the Lumbers running around. Also if SMB and Stagger Storm has got you down in PvP then you can finally nail those bombers, at least until they pull out VT. All in all, it is kind of a sad version of Skolver.
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@Devs - Could you reconsider some of these stats? Snarbolax is a good example of filling a hole of something that isn't in the game while still being attractive in terms of bonuses. The other sets are either unappealing versions of something existing or have bonuses that aren't appealing to an endgame player.
I think my biggest issue is with the bonuses. 5* should have Medium bonuses, as everything else in the game uses. Low bonuses don't work well with anyone's endgame arsenal because by that time they would have everything built around Medium, Very High, Max. Which is why people rush to 5* because 4* bonuses don't gel well. Also why WHB and CIV's High is so weird, you are going to end up wasting some bonus or sitting with Ultra.
Yhea, allot of this seems random.
Snarbolax makes sense, and using an almarian helm with, say vog, grants you medium fire and curse, the two peices of UFSC. I think the point is that they don't want to make armor specificaly geared toward UFSC, thus making it harder than FSC. Either way, I'm playing red roar until I get a deadshot peice to use with my volcanic on UFSC.