Footage of the new downloadable content--the Deluge DLC pack--has piqued my interest. Why? Because explosions are awesome and the launch trailer for the DLC is made up of mostly explosions. My estimates put it at about 94%--leaving 6% for capturing and editing.
BOOM video 7207
The Deluge DLC is launched yesterday on the Xbox Live Marketplace for 560MS Points ($7) and adds a four-player "Horde-like" mode where players battle against waves of enemies.
The content also packs with it a capture the flag variant called "Capture the Orb." That part doesn't sound like it has explosions in it, though, so don't even worry about it.