There are three new "official" mutators (game modifications) for Unreal Tournament on the Digital Extremes website. Here's word from GameFan on what they do:

• Volatile Ammunition: This mutator makes any ammunition pick-up in the game explode when shot. Punish the ammo-hog with a devastating Flak-ammo chain reaction!
• Volatile Weapons: When you kill your enemies, their weapons explode! Think twice before using the Impact Hammer on those rocket-launching newbies!
• Team Beacon: Places a yellow icon above teammates in team games. A must-have for the CTF junkies!