From Halo Bulletin 8-15-12:
Wetwork Specialization: Spartan optimization for stealth operations which focus on the elimination of an enemy target with the goal of leaving no tactical footprint behind.
Stealth Armor Mod: The Stealth armor allows users to move quickly and silently in combat, executing enemy assassinations with lightning fast dexterity.
The Stealth armor mod – which has very sharp shapes and angles, reminiscent of a knife or blade – does a number of things to help a player that likes to get up close and personal. It adds sound dampening when sprinting, animations are performed faster (to minimize the time you’re vulnerable), and it has a minor effect on Promethean Vision. Typically, when Promethean Vision is activated, people appear red. When you use Stealth, though, only your outline appears red. Many times when someone is using Promethean Vision, they scan quickly so if there’s a lot going on, they may miss you. Or you can hope, anyway.
Objective: Great for those who are into sneaky close quarter combat.
Subjective: I’m likely never going to use this mod as I’m horrible at assassinations anyway. Yes, it would make me better at it, but I don’t go for assassinations typically, so it would be a wasted mod for me.
I like that the mod dampens your footfalls and makes the animations faster.
Armor: The helmet reminds me of a bird. Feathered top and small pointed beak. It’s likely the closest we’ll get to Hayabusa again, so take that for what it’s worth.
Emblems: I actually kind of like these. None of the strike my fancy in particular, but all work for the Wetwork specialization. Thank goodness we’re getting a slew of new emblems in Halo. I have to be honest, the old ones were getting quite stale.