Coming to PC, PlayStation 3 and Xbox 360, the game represents "a worldwide production effort led by the [AC2 developer] Ubisoft Montreal." Contributing are Ubisoft Singapore, Bucharest, Quebec City and Annecy--the latter having been responsible for the multiplayer component of Splinter Cell: Chaos Theory.

Explained Ubisoft of the game's single-player:

The critically acclaimed single-player experience of Assassin's Creed is back and better than ever as Ezio returns in an epic struggle against the powerful Templar Order. Now a legendary Master Assassin, he must journey into Italy's greatest city, Rome, center of power, greed and corruption to strike at the heart of the enemy. Defeating the corrupt tyrants entrenched there will require not only strength, but leadership, as Ezio commands an entire Brotherhood that will rally to his side. Only by working together can the Assassins defeat their mortal enemies.

As for the multiplayer component, the company had this to say:

And for the first time, Assassin's Creed Brotherhood offers a never-before-seen multiplayer layer. Players can help the Templars by using Abstergo to train in the art of Assassination to eliminate the Assassins once and for all. Players can choose from a wide range of unique characters, each with their own signature weapons and assassination techniques, and match their skills against other players from all over the world in different game modes.

In addition, Ubisoft also provided the below fact sheet:

Product Description
Live and breathe as Ezio, a legendary Master Assassin, in his enduring struggle against the powerful Templar Order. He must journey into Italy's greatest city, Rome, center of power, greed and corruption to strike at the heart of the enemy.

Defeating the corrupt tyrants entrenched there will require not only strength, but leadership, as Ezio commands an entire Brotherhood who will rally to his side. Only by working together can the Assassins defeat their mortal enemies.

And for the first time, introducing a never-before-seen multiplayer layer that allows you to choose from a wide range of unique characters, each with their own signature weapons and assassination techniques, and match your skills against other players from around the world.

It's time to join the Brotherhood.

Key Features

• MASTER THE POSSIBILITIES – As Ezio, a legendary Master Assassin, experience over 15 hours of single-player gameplay set in the living, breathing, unpredictable city of Rome.
• LEAD A LEGENDARY BROTHERHOOD – Recruit and train promising young Assassins. Deploy them across the city as you see fit, or call upon them to aid you in your quests.
• EXPERIENCE A RICH HISTORICAL TAPESTRY – Collaborate with real historical characters such as Leonardo da Vinci, Niccolo Machiavelli and Caterina Sforza.
• WIN THE HEART OF A CITY – Use your hard-won currency to revitalize the crumbling capital city. Rally the citizens to your cause and unlock extra factions and missions.
• DEPLOY SECRET WEAPONS – Swiftly eliminate your enemies using tools such as poison darts, parachutes, double hidden blades, hidden guns, and an advanced flying machine at your disposal.
• MEMORABLE MULTIPLAYER – Choose from multiple authentic character classes, each with their own signature weapons and killing moves. With richly-detailed maps and a wide variety of unique multiplayer modes, you'll never fight the same way twice.