New Gears of War 3 Game add-on announced today. Here are the highlights from the press release:

Today, Microsoft and Epic Games announced “RAAM’s Shadow,” the new campaign experience for the award-winning blockbuster, “Gears of War 3.” Starring a cast of characters both new and eerily familiar to the series, “RAAM’s Shadow” will deliver more than three hours of gameplay set in a storyline that precedes the events of the first “Gears of War,” as well as six new multiplayer characters, the Chocolate Weapon Set and an additional 250 Gamerscore. “RAAM’s Shadow” will launch Dec. 13 for 1,200 Microsoft Points on Xbox LIVE Marketplace, marking the second major game add-on for this year’s critically-acclaimed blockbuster, “Gears of War 3.”

Update: Yes, this game add-on is included in the Gears of War 3 Season Pass