Beyond Unreal cracked open the most recent issue of OXM and discovered that Unreal Tournament 3 will ship with a good 3-4 dozen multiplayer maps.
Aside from the gameplay shown in the video, it offered a few details about the game. It was said that the original idea was to make gigantic maps utilizing UE3's streaming technology for up to 64 players at once. They decided that it didn't feel like a UT game and went back to improving the original formula. Each map starts out as a basic BSP layout and is play tested until they think it is fun and then it is handed over to have static meshes and the rest of the artistic assets created. There will be 3 to 4 dozen multiplayer maps in the retail version of the game. The single player portion will have even more maps than multiplayer.