Maps:
Checkout
Thrashball (these four were in the beta, we all know what they're like
Trenches
Oldtown
Mercy
Overpass (these were the other two beta maps that we didn't get, but many folks have played them at public events or at least seen many official videos and screens of them)
Gridlock (Now with a new theme, Char, which is a city Epic has mentioned that you visit, petrified corpses are all over the map and turn to dust when you shoot them. Things are smoking or on fire. The map has an old world/ medieval motif, instead of water, there is a massive drop off, you can see the ruined city in the distance, the map is set at night, with full moon illuminating everything)
Azura (Jacinto 2.0, a vibrant royal courtyard of some sort with plants, waterfalls and fountains)
Dry Dock (an abandoned shipping yard during the day. Really bright and colorful. Looks like something from Brink)
Rust Lung (Inside, what appears to be a battleship, during a storm out at sea, reminds me of Process from Gears 1. It looks like you can summon a Silver Back too)
Sand Bar (large beach level shown at E3)
Hotel (shown at E3, beach resort/ casino at night)
COG:
Marcus, Cole, Baird, Dom
Clayton, Dizzy, Sam, Prescott
Anya, Cole Train (aka Thrashball Cole), Jace, Onyx Guard
Griffin, Bernie, Commando Dom (aka Rambo Dom), Civilian Cole (aka Bling Cole)
Civilian Marcus (Marcus, what appears to be in regular ass civilian attire and no bandana)
Adam Fenix and Mechanic Baird are not present, since those are obtained through special codes once the game is actually released in September.
Locust:
Drone, Savage Grenadier, Sniper, Grenadier Elite
Grenadier, Theron Sentinel (no helmet), Beast Rider, Flame Grenadier
Kantus, Myrrah, Savage Drone, Savage Theron
Beast Mode playable Locust:
Naked Ticker, Ticker, Serapede, Berzerker
Wretch, Kantus, Corpser, Armored Kantus
Savage Drone(?), Bloodmount (+ Beast Rider), Savage Grenadier, Reaver (+ two Drones)
Butcher, Boomer, Mauler, Savage Boomer
Other Savage variants, such as the Savage Kantus aren't avaiable, just like Adam Fenix and Mechanic (which is probably Civilian) Baird.
All five starting weapons have 14 skins, not including the default skin.
The Vulcan is a new power weapon. It's a shoulder mounted Mulcher, with massive belt fed ammo clip that is held by another player. Firing it causes your character to yell and talk shit to the enemy.
The Onyx Guard (which I remember seeing in a magazine scan AGES ago) has a mechanical/ robotic voice. Sam and Bernie appear to have Australian accents.