The ones implemented are:

Ironblood - Grey Trooper
"Not only do we fight to protect the people, we also fight to protect ourselves"
Heavy plated troopers that rivals the thickest of Sectopods, slightly better stated than Troopers

Dead Shot - Green Trooper
"We will never miss those who wish to harm our new way of life"
High chance of hitting targets for low damage

Lightbringer - White Trooper
"We bring new light to those who wish to stay in the dark"
Throws flashbangs

Speedhunter - Blue Trooper
"We will find the enemy and we will find them swiftly"
Chasing unit, built to chase down running enemies

Fringe Patrol - Brown Trooper
"We are always under high alert for any who dares disrupt our peace"
High detection radius, to counter XCOM sneak attacks

Sidestepper - Pink Trooper
"We must evade the mistakes of the old world"
High dodge chance

Armortrifter - Teal Trooper
"The fringe elements always find a way to pierce our hearts, so we must pierce theirs"
Pierces through the toughest of armors, making them valuable against heavy foes

Venomspewer - Purple Trooper
"Do not listen to the lies our enemies wish to poison you with"
Shoots poison and gas grenades

Infernoblast - Bright Red Trooper
"The firey passion of ADVENT will save the entire world"
Shoots fire/flamethrower and flame grenade

Bushwhacker - Khaki Trooper
"Our enemies can not stand the power of the peace we created"
High chance of critical hits, dodges shots well

Echogunner - Green Camo Trooper
"We must defend ourselves when threatened"
Constantly overwatches, fires when the enemy does an action

Acidtrigger - Yellow Trooper
"Our new hope will melt away the trapping of the old world"
Shoots acid and acid grenade

Crimsontank - Red Shieldbearer
"We have given been given better life through the Elders"
High health to absorb attacks, lower chance to hit

Site Vandal - Urban Camo Trooper
"Our new way of life uncovers the failings of the past"
Destroys the cover of enemy units

Death Ageis - Purple Trooper
"We will never give in to the past world"
Has Stasis

Plate Bastion - Black Shieldbearer
"Let ADVENT protect you from all harm"
High armor, but low health

Worldwrecker - Yellow Shieldbearer
"We will pave the way for a better future"
Throws grenades quickly and dangerously

Ripshredder - Orange Trooper
"Do not fear the ADVENT peacekeepers, as they deal with threats with the most humane of efforts"
Deals extra damage to organic targets

Combat Junkie- Spruce Trooper
"Thanks to our new gene therapies, we can enhance our humanity"
Uses Overdrive serums after noticing their enemies

Ammo Jammer - Dark Green Trooper
"The Old World technology is weak, let us finally surpass it"
Sometimes causes guns to jam when shots are successful

Daze Stinger - Dark Yellow Trooper
"While the old ways stutters, we shall stride with confidence"
Low damage, but shots sometimes daze

Shadow Assassin - Purple SL
"You won't be able to react to the plans we have next"
Overwatch is not triggered by these units

Lightning Reaver - Yellow SL
"We move swiftly towards a better tommorow"
Highly agile, can dodge most attacks

Trollbreed - Brown Shieldbearer
"Let us regrow into brand new life"
Regenerates health