Today sees an XBOX Live Arcade release, themes, episodes and game content. Here’s the full list:

*Update*

Minutes after the update was posted, more content came though:

Name: Chris Paul Introduces "Black Magic" Video HD
Price: Free
Availability: All Xbox LIVE regions
Size: 130.46 MB
Description: [ESRB: RP (Rating Pending)] Go all-access with CP as he prepares for his role in the groundbreaking ESPN documentary “Black Magic." Paul will introduce the film on the second night of airing and is the only active NBA player involved in this project. “Black Magic” chronicles the injustice that spurred the Civil Rights Movement in America as told through college basketball players and coaches from Historically Black Colleges and Universities.

Name: Undertow - Path of the Elect
Price: 200 Microsoft Points
Availability: All Xbox LIVE regions
Description: [ESRB: E10+ (Everyone 10+) FANTASY VIOLENCE] Download the first expansion to Undertow! Play as the Elect through their ALL NEW five level campaign! Includes four awesome new multiplayer maps, and adds the Elect as a playable race! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Rocketmen Picture Pack #1
Price: 40 Microsoft Points
Availability: Not available in Japan, Korea
Description: Download these 5 Rocketmen gamerpics now and join the Alliance of Free Planets’ campaign in their frenzied struggle to free the Solar System! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Rocketmen Picture Pack #2
Price: 40 Microsoft Points
Availability: Not available in Japan, Korea
Description: Download the second set of Rocketmen gamerpics now and join the Alliance of Free Planets’ campaign in their frenzied struggle to free the Solar System! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Chessmaster Live Classic Set
Price: 80 Microsoft Points
Availability: Not available in Japan, Korea
Description: [ESRB: E (Everyone)] Download this brand new 3D chess set and have more fun playing chess! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Chessmaster Live Mechanica Chess Set
Price: 80 Microsoft Points
Availability: All Xbox LIVE regions
Description: [ESRB: E (Everyone)] Download this brand new 3D chess set and have more fun playing chess! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Ace Combat 6: F-117A -GENERAL EMBLEM-
Price: Free
Availability: All Xbox LIVE regions
Description: [ESRB: T (Teen) Mild Language, Violence] F-117A Night Hawk, General Resource Aircraft Available! Ace Combat 3, General Resource Aircraft. A lightened fuselage allows for increased weapons payload. Built upon an array of technology, this aircraft boasts assured attacking prowess. Wielding the might of the world economy, none can stand against the massive international conglomerate, General Resource. Once downloaded other player aircraft will also reflect the content of Aircraft , otherwise other player aircraft will appear as Emmerian colors.

Name: Undertow - Theme 1
Price: 150 Microsoft Points
Availability: All Xbox LIVE regions
Description: Download this custom theme from the award winning Undertow! There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

Name: Rocketmen: Axis of Evil
Price: 800 Microsoft Points
Availability: Not available in Japan and Korea
Description: [ESRB: E10 (EVERYONE 10 +)FANTASY VIOLENCE, MILD SUGGESTIVE THEMES] Single Player, Xbox LIVE Multiplayer 1-4, Local Multiplayer 1-4, HD (High Definition). Join Rocketmen Nick Sion, Alec Mink and the Alliance of Free Planets in their white-knuckled struggle to free the solar system from the tyrannical grip of the Legion of Terra in this RPG styled shooter. Players have the choice to save the galaxy alone or cooperatively with up to three other players over Xbox LIVE or locally on the same console. With its distinctive cel-shaded art style, engaging storyline, customizable characters and RPG elements, this shooter will keep players coming back for more. There are no refunds for this item. For more information, see www.xbox.com/Live/accounts.

Name: Bully Scholarship Edition Theme
Price: 100 Microsoft Points
Availability: Everywhere

Name: Rocketmen Theme
Price: 100 Microsoft Points
Availability: Everywhere

Name: 2007 MLG Pro Circuit: Episode 3
Price: 160 Microsoft Points
Availability: Everywhere

Name: 2007 MLG Pro Circuit: Episode 4
Price: 160 Microsoft Points
Availability: Everywhere

Name: 2007 MLG Pro Circuit: Episode 5
Price: 160 Microsoft Points
Availability: Everywhere

Name: 2007 MLG Pro Circuit: Episode 6
Price: 160 Microsoft Points
Availability: Everywhere

Name: Universe at War: Earth Assault Theme
Price: 150 Microsoft Points
Availability: Everywhere

Name: GRAW 2 Co-Op Collection 2
Price: 400 Microsoft Points
Availability: All Xbox LIVE regions
Description: [ESRB: T (Teen) BLOOD,LANGUAGE,VIOLENCE] GRAW 2 Co-op Collection 2 brings back some of the greatest maps in Ghost Recon history and let’s you cooperate and compete in exciting new locales. An all new co-op campaign with 5 missions takes you back to some of the greatest locations from the Ghost Recon franchise. Inspired from the original Ghost Recon and remade to the stunning benchmark from GRAW 2. 9 new adversarial maps – 7 inspired from the greatest in the franchise and 2 brand new maps. 8 new Achievements with a total of 125 points. Exciting new challenges that encourage different tactics. The ghosts are back again. There are no refunds for this item. For more information, see www.xbox.com/live/accounts
Size: 976.09 MB
Extended Description (from the press release): The GRAW2 Co-op Collection 2 consists of five co-op campaign missions that continue the story from GRAW2 Co-op Collection 1. In total there are nine maps, seven of which are classic maps from Ghost Recon’s illustrious history and two that are totally brand new. All nine maps (including co-op campaign maps) have exquisite visuals and support all of GRAW2’s thousands of customizable game modes.
 
CO-OP MAPS
 
New Co-op Campaign – Story: Rebel leader Manuel Suazo Azcona continues his quest to destabilize the governments of both El Salvador and neighboring Honduras despite the Ghosts’ efforts to disrupt his organization. As the vice begins to tighten on the rebels, more key players begin to fall out and defect. Using the information from the defectors, the Ghosts need to release Azcona’s stranglehold on the country by taking out his supply points and escorting relief trucks into the area. Finally, the Ghosts will need to infiltrate Azcona’s compound and take him out, ending the rebellion once and for all.
 
Bridges – (Ghost Recon: Island Thunder)
Mission Briefing: We’ve been contacted by an enemy defector with intel on Azcona’s plans. It appears he has since been captured, but not before dumping his laptop in the jungle. Find that laptop, save our turncoat, and extract ASAP – he won’t last long.
 
Stronghold – (Ghost Recon: Island Thunder)
Mission Briefing: The rebel defector is now in your custody at an allied safe-house. A large enemy force is moving rapidly on your coordinates to try and silence him. You must defend this stronghold and keep the VIP protected.
 
Depot – (Ghost Recon: Desert Siege)
Mission Briefing: The defector’s intel has revealed another of Azcona’s supply points: a rail depot. Take out the ADATS defending its airspace and then clear out the depot area. Let’s get a tracker on that helo and see if it leads us to Azcona.
 
Riverbed – (Ghost Recon: Desert Siege)
Mission Briefing: This one is a bit different, Ghosts: You'll be escorting relief trucks to the refugees along the border. With Azcona’s army falling apart, his men are desperate and have begun raiding aid convoys. Let’s do some good, people, and put a stop to it.
 
Ghost Town – (Ghost Recon: Desert Siege)
Mission Briefing: This is it, Ghosts. We’ve tracked those supplies to Azcona himself. He’s holed up in his junkyard compound with a large vehicle pool. Gather any maps or intel you may find, but your primary objective is to terminate Azcona’s command.
 
ADVERSARIAL MAPS
 
Bridges – (Ghost Recon: Island Thunder) - Medium map suitable for 8 to 12 players.
Overview: Numerous bridges span a river winding through hilly jungle. Thick foliage provides cover and a few sniper spots. Supports medium- and long-range combat.
 
Stronghold – (Ghost Recon: Island Thunder) - Large map suitable for 12 to 16 players.
Overview: A central stronghold on a hill surrounded by deep valleys. Supports multiple play types from stealthy sneaking to defending from towers.
 
Depot – (Ghost Recon: Desert Siege) - Large map suitable for 12 to 16 players.
Overview: Large train depot facility surrounded by rocky hills. A high ground vs. low ground dynamic with lots of open terrain and long sightlines.
 
Riverbed – (Ghost Recon: Desert Siege) - Large map suitable for 12 to 16 players.
Overview: A dry riverbed snakes through weathered rock formations and various ruins. A mixture of terrain and cover supports all types of combat.
 
Ghost Town – (Ghost Recon: Desert Siege) - Medium map suitable for 8 to 12 players.
Overview: Dry, dusty shantytown in the midst of a sandstorm. A large villa sits on the hill in the center of the map. Some CQB in town and other opportunities for snipers.
 
Roadblock – (Ghost Recon: Desert Siege) - Medium map suitable for 8 to 12 players.
Overview: A steep hill with an ancient fortress at the top and a roadblock at the bottom. Rolling terrain and scattered ruins dot the landscape.
 
Island – (Ghost Recon: Island Thunder) - Small map suitable for 4 to 8 players.
Overview: Small tropical island with a lighthouse perched upon a rocky hill at its center. Maze-like paths through tall grass lead to the caves in the hill.
 
Treatment Plant – (Brand New) - Small map suitable for 4 to 8 players.
Overview: Rusting pipes and tanks highlight this water treatment plant under repair. An open center area contrasts with a dense mixture of waterworks and construction.
 
Mining Camp – (Brand New) - Small map suitable for 4 to 8 players.
Overview: An abandoned mining facility carved into a mountainside. Catwalks provide access to the interior cave spaces. Mostly medium range and CQB, allowing stealthy players to flank opponents.

The new achievements can be found at the bottom of here (starting from Bridges (Co-op) Perfect)

Source: Here