Disclaimer: There is no guarantee that this list is 100% set in stone at Bioware.
New classes
Turian Havoc Soldier - Cryo Blast, Havoc Strike, Stimulant Pack
Turian Saboteur Engineer - Sabotage, Sentry Turret, Homing Grenade
Turian Ghost Infiltrator - Overload, Tactical Cloak, Stimulant Pack
Asari Valkyrie Sentinel - Tech Armour, Annihilation Field, Warp
Asari Huntress Infiltrator - Tactical Cloak, Dark Channel, Warp
Quarian Marksman Soldier - Marksman, Tactical Scan, Sabotage
Volus Engineer - Proximity Mine, Shield Boost, Recon Mine
Volus Adept - Stasis, Biotic Orbs, Shield Boost
Volus Mercenary Sentinel - Decoy, Combat Drone, Shield Boost
Volus Protector Vanguard - Biotic Charge, Biotic Orbs, Shield Boost
* Volus seem to have a base weight capacity of 15%
Drell Assassin Infiltrator - Tactical Cloak, Homing Grenade, Recon Mine
Geth Trooper Soldier - Hunter Mode, Flamer, Fortification
Krogan Shaman Adept - Barrier, Shockwave, Warp
Batarian Slasher Adept - Warp, Cluster Grenade, Lash
Batarian Brawler Vanguard - Biotic Charge, Blade Armour, Lash
Vorcha Hunter Engineer - Bloodlust, Incinerate, Submission Net
New Abilities
Biotic Orbs
Shield Boost - Restores shields to yourself and nearby allies.
Havoc Strike - Charges the enemy with your jetpack. Similar to Biotic Charge except no shield restore and no damage immunity.
Stimulant Pack - Massive shield boost. Can be upgraded to boost damage.
Recon Mine - Provides AoE vision like Tactical Scan, and can be detonated for damage.
New Weapons
Collector Assault Rifle - Same as the promotional one
Collector SMG - Ultra Rare
> Weight: 0.75 - 0.35
> Damage: 75.2 - 94.1
> Rate of Fire: 800
> Clip Size: 20 - 30. Has Infinite Spare Ammo.
> 1 second delay on ammo recharge if not empty clip. 3 seconds if empty.
Collector Sniper Rifle - Rare
> Weight: 2.0 - 1.4
> Damage: 66.7 - 83.4
> Rate of Fire: 800
> Clip Size: 25 - 35. Has Infinite Spare Ammo.
> 1 second delay on ammo recharge if not empty clip. 3 seconds if empty.
New Ammo Powers
Phasic Rounds
> 5 to 15% damage bonus
> 15 seconds of shield regeneration negating.
> I would assume this has the ability to get around shielding somehow as well, but it doesn't show in the Coalesced.
Polonium Rounds
> 20 - 40% damage over 10 seconds
Needler Rounds(Explosive Rounds)
> 10 - 30% damage
> 50 - 250 max explosion damage
> 150 - 250 radius
> 1.5 second delay
Eraser Rounds
> 10 - 40% armour reduction
> 10 - 30% damage
> 1 - 2.5m penetration
New Units
Collectors
> Scion
> Collector Trooper
> Collector Captain
> Abomination
> Praetorian
> Seeker Swarms
Cerberus
> Cerberus Dragoon
Geth
> Geth Bomber