New Classes added today, they basically completed the Avengers line up that started with The N7 Destroyer and Paladin.
Adept = Awakened Collector (apparently Leviathan freed some of them from Reaper control, Javik moveset)
Infiltrator = Alliance Infiltration Unit (EVA/EDI, fast as hell, great with shotguns, can self-rez)
Soldier = Geth Destroyer (It's heavy melee is like a force choke that works on everything and stuns Banshees/Phantoms, it has the most shields period, can't take cover, but can drop a shield that absorbs 3000+ damage and can electrocute enemies. It also has the Geth Prime cannon of doom)
Engineer = Talon Mercenary. (Their melee is an Omni-Bow, powers are laser trip mines and concussion/armor piercing bow shots, Basically Hawkeye, the class. The trip mines are strong enough to vaporize a full health Dragoon on silver)
Sentinel = Krogan Warlord (They have a hammer. Their powers empower it. Essentially Thor the class)
Vanguard = Female Turian (They use poison and their 'charge' is a dash that goes through just about everything and can get you aruond the map quick. She's hard to use properly.
New weapon mods = Ultralight Materials for Sniper Rifles and Assault Rifles, Mod for pistols and submachine guns that increases power damage
New weapons
Pistol = Blood Pack Executioner a 1 shot per clip armor piercing pistol.
M=11 Suppressor, a Silenced pistol a pistol that doesn't draw aggro
Submachine Gun = Bloodpack Punisher. It periodically fires an armor piercing round.
Shotgun = Venom Shotgun
Rifle = Adus Anti-Synthetic Rifle, essentially a Saber made for synthetics.
Geth Spitfire, M7 Lancer
New Gear Kits
Batarian Gauntlet = Changes your Heavy Melee into something new
Geth Scanners = Lets you see enemies through walls.
No new maps. The Geth Juggernaut is extremely overpowered. Downsides are that he can't take cover and walks really slow, though he doesn't need to take cover since he can provide his own. His shield ability also scales with the health/shield upgrade tree. The Alliance Infiltrator is basically Geth Infiltrator only with more speed, great melee, and self-rez. The Talon Mercenary's crossbow is... iffy. Doesn't seem to do as much damage even with the power modifications but his trip mines are excellent.