The Nightstalker is the new sub-class for the Hunter, and is a sub-class obtained by completing the quest, The Nightstalker's Trail.
As you'll note below, the Nightstalker has an incredibly powerful Super that allows him to tether enemies to a single location. Unsurprisingly, this is incredibly powerful in a Raid environment as it allows Nightstalker's to control the flow of enemies that are attempting to attack. Alongside this, the Nightstalker gains a powerful set of Grenades and melee modifiers to make him a powerful addition to PvP.
Grenades
Spike Grenade: A grenade that attaches to any surface and emits a torrent of damaging void light.
Voidwall Grenade: A Grenade that creates a horizontal wall of burning void light.
Vortex Grenade: A grenade that creates a vortex which continually damages enemies inside the sphere.
Class Ability Modifiers (Dodge)
Gambler’s Dodge: Dodging near enemies generates Melee energy.
Marksman Dodge: Automatically reload your equipped weapon while dodging.
Movement
Jump a second time after leaving the ground
Modifiers
Better Control: Upgrades Double Jump for better directional control.
Triple Jump: Upgrades Double Jump with a third jump.
High Jump: Upgrades Double Jump for even greater height.
Super
Shadow Shot: Tether a large group of foes to a Void Anchor, slowing and silencing them for your fireteam.
Modifiers
Blood Bound: Tethered enemies explode when killed. Damage to tethered enemies is shared to all.
Black Hole: The Void Anchor has increased range, lasts significantly longer, and can tether more targets.
Quiver: Fire Shadowshot up to three times. Void Anchors have reduced range.
Melee
Smoke: Throw smoke to slow and disorient those within its cloud.
Modifiers
Envenomed: Adds a toxin that damages enemies within the smoke.
Vanish in Smoke: You and allies near Smoke explosions vanish from sight.
Snare: Allows smoke to stick to surfaces, detonating when enemies are near.
Class Modifiers
Path Forgotten: Training focused on toughness and speed.
Path Forbidden: Training focused on battle recovery and speed.
Path Unknown: Training focused on battle recovery and toughness.
Ability Modifiers
Courage of the Pack: Killing tethered targets increases Recovery and Armor for you and nearby allies. Stacks up to 5 times.
Light of the Pack: Killing tethered targets creates Orbs of Light for your allies.
Lockdown: Grenade and Smoke effects last twice as long, allowing strong territory control.
Attribute Modifiers
Way of the Drifter: Training focused on all attributes.
Way of the Fearless: Training focused on toughness at all costs.
Way of the Nomad: Training focused on maximum battle recovery.
Ability Modifiers
Keen Scout: Sprint and Sneak faster, gain Enhanced Tracker, and ability to Mark targets you damage.
Predator: The Void Anchors fired from Shadowshot become traps that stick to surfaces and wait for prey.
Shadestep: Press Crouch, Crouch to evade.